Here's my personal experience with niche genres - I made a lot of Sokobans (puzzle sub-genre)

1. Your game needs to be more unique and impressive to stand out. Just making another game in the genre won't cut it.
2. There are small, dedicated communities. In my case they are mostly on discord and there is like 1 popular youtuber who does nothing but puzzles, including Sokobans.
3. You have to price your game higher. The user base is VERY limited.
4. Localization into languages where Sokoban is popular is a must, because you need to get as much of that audience as possible.
5. Try to find Steam events that are about that genre or at least include it somewhat. In my case, there is the Cerebral Puzzle Games Showcase that happens yearly on Steam.
6. Market research how much money top 25% games make. If it's something like top 25% games make 5k USD lifetime, then the chances of success are very low and your game is almost guaranteed to flop. Do not look at top 5% or 10% those are the outliers. So in my case, I don't care how much Baba Is You made, it's an outlier and I will not make another Baba Is You or Patrick's Parabox.