Choose a niche that you love (and feels a little insane). Then search for clues that it might work.
One of the most common questions I get is "How do I choose a niche for my passive income business?"
We're all looking for our own little unique corner of the market. A place where we can make great art and people will shower us with money for doing it.
The truth is that finding the right niche is a mix of research, luck, and enough insanity to stand out.