The question is how do you create a niche? And the reason i ask this on hackernews is because there must be more interesting stuff happening than spammy newsletters and cheesy “self help” books.
You create a niche by looking at layers of a niche. What appears like one niche is actually a rubble pile of loose rocks held together by some gravity. You can pick off some larger rocks and create your own niche around that.
Basically niches are a bit like Mandelbrot sets. If you study then you will see more creases and patterns at the edges.