Tapping into an existing, niche community seems to be a pretty common and successful method. Does your project help solve a common problem for a narrowly define

Tapping into an existing, niche community seems to be a pretty common and successful method. Does your project help solve a common problem for a narrowly defined group of people? If so, is there a forum where this problem is commonly discussed? Become a helpful member of this community. Ask and answer questions there without only constantly pushing your project in a spammy way.