Being in a genre with a small population isn't always bad. I'm in the Action section and I get to trend on the front page of my category every time I update. Sure, there are fewer people looking on Tapas for action or Sci-Fi than BL, but the people there are are ravenous for new content because there's not a lot of it, so if you make a good comic in an underpopulated genre, you're a big fish in a small pond.
If a person is looking for BL and you have a BL comic, the chances of them finding yours are very slim, there's just so much choice, but if a person is looking for Action and you draw Action, the chances they find your comic are pretty high, so even though fewer people are looking, a much higher proportion of those people will find your work.
So my advice is, go for it. Make a comic you're passionate about and know you can make a good job of. The audience is smaller, but they won't take you for granted.