Ideas to find a niche for self-publishing

I get this guy's newsletter. I almost never read them but it looks like he offers valuable content.

Software. I've tried it out for research but haven't implemented it to the point of publishing something based on my findings. Not sure how reliable it is but it seems useful.

James interviewed the founder. I get the free newsletter. That's how I found out about japandi, so I created a japandi-style notebook and I've sold a handful of them over the span of a year or so. I feel like getting the Premium version would be very useful to get in on profitable KDP niches before they blow up.

Look up what you might be interested in and see if there seems to be a growing trend.

If you can bare it, look through TikTok and see what's trending. Maybe you can find something that can be written about. People do this to find a dropshipping niche. Let's say you see that a plant milk machine is trending, you could look into publishing plant milk recipes.

"How to stop anxiety" is oversaturated for sure, but what about 'Christianity and anxiety'? You can combine the saturated niche with another saturated niche or a non-saturated one. Anxiety and veganism? How crocheting can cure your anxiety? Who knows.

Try asking ChatGPT for ideas.

A friend of mine uses an email address exclusively to sign up to newsletters. Good idea.

Business newsletters might be particularly helpful, but it doesn't have to be only those.

Maybe you can share them on Facebook groups, Reddit, or even just among your friends. Something that might give you an idea of what people are interested in. Like "When it comes to ______, what kind of book would you be susceptible to buy?"

Look at the softwares and courses being sold. Maybe they can lead to an idea for a KDP niche?

Same idea as above! Maybe you'll stumble upon a course about how to write poetry and think "oh yeah, I could publish a book on how to write poetry".

Would I want to publish eBooks on accounting? Probably not, even if I barely had to do any of the work myself.

I wrote #11 because I think it's better to find a niche you like (or believe in) so that it doesn't get boring, but if you don't mind something boring, maybe there will be less competition and it's worth looking into?