Substack Content Pillars: How to Pick 3 Core Themes That Attract the Right Readers
You sit down to write your newsletter and your brain goes blank.
What do I send this week? What do my readers even want?
If that sounds familiar, you’re not alone. Most Substack writers start with raw enthusiasm, then hit a wall when the ideas run dry. The fix is not “more motivation”. The fix is clear substack content pillars.
When you choose three strong themes, you stop guessing. You know what to write, which readers you’re speaking to, and how each issue fits your bigger vision.
Let’s build that kind of clarity for your Substack.
What Are Substack Content Pillars?
Content pillars are your main themes. Think of them as three sturdy legs under your newsletter table.
Everything you publish should rest on one of those legs.
For a Substack writer, content pillars:
- Give you a clear focus, so you’re not all over the place
- Help new readers know what they’re signing up for
- Make planning easier, because topics fall into neat buckets
- Attract the right readers, not just random clicks
Here’s a simple way to see it:
- If a topic fits one of your pillars, it belongs in your newsletter
- If it doesn’t, it’s either a side note or something to drop
You’re not locking yourself into a box. You’re setting a clear promise.
The 3-Part Filter For Strong Content Pillars
There are many things you could write about. The question is, which ones should turn into lasting pillars?
Run each idea through this 3-part filter.
1. You can talk about it for years
Ask yourself: “Can I still write about this a year from now without wanting to scream into a pillow?”
If the answer feels like a hard no, it’s not a pillar.
You want themes that tie into your curiosity, your work, or your lived experience. Topics you’ll keep learning about anyway.
Good signs:
- You already talk about it with friends
- You notice it in books, podcasts, daily life
- You have opinions, stories, and examples
If you feel bored while writing the pillar name, trust that feeling.
2. Your ideal reader needs or wants it
A pillar is strong when it lines up with a clear reader need.
Common needs:
- Solve a problem (money, health, career, writing, parenting)
- Reach a goal (publish a book, grow a business, get fit)
- Feel less alone (creative struggles, grief, identity, burnout)
- Enjoy a hobby (books, films, games, cooking, gardening)
Ask: “What change do I want my reader to see after 6 months on my list?”
Your pillars should help that change happen.
3. It supports your bigger vision
Your Substack sits inside a bigger picture. Maybe you want:
- Clients for your freelancing
- Readers for your book
- Paid subscribers around a niche
- A clear personal brand in your field
Each pillar should connect to that picture.
If a topic is fun but leads nowhere, keep it as an occasional “bonus”, not one of your three core themes.
How To Pick Your 3 Core Substack Themes
You do not need a fancy strategy day. A focused hour is enough.
Step 1: Brain dump everything you care about
Set a 10-minute timer. Write down every topic you’d like to cover on your Substack.
Examples:
- “Behind the scenes of my writing process”
- “Case studies of people changing careers”
- “Book notes on psychology”
- “Short fiction set in my universe”
Do not edit. Just get it all out.
Step 2: Group similar ideas into clusters
Next, circle or highlight topics that feel related.
You’re looking for natural families.
For example:
- “Writing process”, “outline tips”, “draft breakdowns”
- “Mindset for writers”, “imposter syndrome”, “creative fear”
Each cluster is a potential pillar.
Give each cluster a rough name in plain language, like “Writing Practice” or “Career Change Stories”.
Step 3: Stress-test each cluster with 3 questions
For every cluster, ask:
- Can I write about this every month for the next year?
- Does my ideal reader clearly benefit from this?
- Does this support my long-term goals?
If a cluster fails even one question, it’s probably a side theme, not a pillar.
You want three clusters that feel sturdy on all three tests.
Step 4: Name each pillar in reader language
The name of the pillar should tell a new reader what they’ll get.
Compare:
- “Random Thoughts” vs “Honest Notes From a Working Novelist”
- “Mindset” vs “Calm, Confident Creative Work”
The second version in each pair is clearer and more inviting.
Use simple words. Skip buzzwords. Picture someone finding you on Substack search. Would they click “Subscribe” based on those three pillar names alone?
Example Substack Content Pillars For Different Niches
Here are some sample setups to spark ideas.
| Niche | Pillar 1 | Pillar 2 | Pillar 3 | Recurring Sections Example |
|---|---|---|---|---|
| Writing & publishing | Writing practice | Story of a working writer | Publishing insights | “Process Tuesday”, “Behind-the-Scenes Friday” |
| Personal finance | Money systems | Mindset around spending | Real reader case studies | “Monthly Money Map”, “Case Study Saturdays” |
| Creator business | Content strategy breakdowns | Audience growth experiments | Personal founder diary | “Experiment Log”, “Creator Q&A” |
| Health & fitness | Simple workouts | Food habits for busy people | Motivation and mindset stories | “3 Moves Monday”, “Sunday Reset” |
| Fiction universe newsletter | New short scenes | Worldbuilding notes | Author commentary | “Story Drop”, “World Notes”, “Author’s Corner” |
Use these as templates, not rules. Your pillars should fit your brain and your readers.
Turn Pillars Into Recurring Sections, Series, And Notes
Pillars are only useful if they show up in your actual publishing rhythm.
Here are simple ways to do that on Substack:
- Assign each weekday to a pillar, for example, Monday for “Tactics”, Wednesday for “Stories”, Friday for “Behind the scenes”
- Rotate pillars across weeks in a month, week 1 is Pillar 1, week 2 is Pillar 2, and so on
- Create recurring sections, a short “Tool of the Week” box that always falls under your “Systems” pillar
For Substack Notes, pillars help you avoid random posting.
You might decide:
- 3 quick Notes per week from Pillar 1
- 2 reaction Notes from Pillar 2
- 1 reflective Note from Pillar 3
A scheduling tool like Dispatchrly can help here. You can batch-write Notes for each pillar, drop them on a visual calendar, then let them auto-post while you focus on your longer pieces.
Check If Your Pillars Attract The Right Readers
Once you have your three themes, treat them like a 60 to 90 day experiment.
Watch for:
- Which issues get the most replies
- Which topics new subscribers mention when they say “I loved this”
- What leads to paid upgrades, if you have them
- Which topics seem to push people to unsubscribe
You can keep a simple note at the top of each draft: “Pillar: X”.
After a month or two, look back and compare performance per pillar.
If one theme always falls flat, you can refine it or swap it.
You are not married to your first choice. You are learning.
Make Your Pillars Sustainable For The Long Term
Strong substack content pillars are not just attractive, they are gentle on your energy.
Here are ways to make them easier to sustain:
- Choose formats that fit your brain: if you hate long essays, let one pillar be “3 quick ideas” instead of deep analysis
- Give each pillar a simple template: for example, “story, lesson, action step” every time
- Keep a running idea bank: a note in your phone or a doc for each pillar
- Batch work: write several posts or Notes for one pillar in one sitting
Tools help here. With Dispatchrly, you can sit down once a week, write a handful of pillar-based Notes, park them in a queue, then let them go out on autopilot while you deal with life, clients, or a day job.
The easier it feels to show up, the more your readers will trust you.
Bring It Together: Your Substack, Your 3 Pillars
Your newsletter does not need to cover everything you know. It needs to deliver a clear promise, over and over, to the people who care.
Three solid substack content pillars give you that promise. They help you decide what to write, what to skip, and who your work is for.
So, set a timer today. Brain dump your ideas, group them into clusters, run them through the 3-part filter, and name your pillars in plain language. Try them for 90 days, adjust as you learn, and let the right readers gather around the themes you commit to.
Your future issues, and your future subscribers, will thank you.
