How do you usually come up with niche ideas for your newsletter?

I’ve been super curious about how others brainstorm niche ideas when starting a newsletter.

Some people I’ve talked to say they pick something they’re already passionate about. Others dig through forums, subreddits, and newsletters they subscribe to until a pattern clicks.

I personally struggled with this for a while — deciding between going broad vs. hyper-niche, picking a category I enjoy vs. one with clear monetization potential, etc.

So out of curiosity (and frustration), I ended up making a small tool that gives newsletter niche ideas based on categories and professions. It’s helped me get unstuck a few times, especially when I’m in “idea fog.”

Just wanted to ask — how do you find your newsletter niche idea?

Is there a process that works well for you?