How to Find Content Gaps With ChatGPT (6 Prompts)

I asked AI to find my newsletter's blind spots

Every newsletter develops blind spots. You write what comes easily, you repeat the angles that once did well, and slowly your content mix narrows without you noticing. You’re not lazy. You’re just standing too close to see the shape of what you make.

I got tired of guessing what to write next. So I handed the problem to ChatGPT, and not in the vague “give me 20 blog ideas” way that produces 20 ideas you’d never publish. I made it audit what I’d already done, find the holes, and fill them with a proper calendar. Three months came out the other side. Most of it was better than what I’d have picked myself.

Here’s the exact sequence.

The idea behind it

The trick isn’t asking for ideas. Anyone can get ideas. The trick is making the model understand your existing mix well enough to spot what’s missing, which is a completely different job.

A gap is only a gap relative to a pattern. So the first half of this is teaching ChatGPT your pattern. The second half is asking it to break the pattern usefully. Skip the first half and you get generic filler. Do it properly and you get ideas that fit your voice but point somewhere you haven’t been.

One note on tiers before we start. The six core prompts run on the free version of ChatGPT. Two optional upgrades near the end use Deep Research and custom GPTs, both of which sit behind the paid plan now. I’ll flag those clearly so you know what’s free and what isn’t.

The six prompts

Run them in one session so the model keeps the context. Each one builds on the last.

1. Feed it the raw material

Don’t describe your newsletter. Show it. Paste in your last 20 to 40 post titles, or the titles plus a one-line summary of each if you have them handy.

Here are my recent newsletter posts, titles and short summaries. Read them as a set, not one by one. Don’t comment yet. Just confirm you’ve got them and tell me you’re ready for the next step.

Making it hold the whole set at once matters. You want it reasoning across the corpus, not reacting to the last thing it read.

2. Make it map what you actually cover

Now group these posts into themes. Give me the real categories my content falls into, not the ones I’d claim. Tell me roughly what share of my output sits in each theme. Be honest if one theme is eating everything.

This step alone is worth the exercise. Seeing your own mix as percentages is uncomfortable in a useful way. I found nearly half my posts clustered in one corner I thought was a sideline.