Find a niche community that has a big pain that no one seems to care about. Learn about their pain and get building. And yes, patio11's Bingo Cards example is a

Find a niche community that has a big pain that no one seems to care about. Learn about their pain and get building. And yes, patio11's Bingo Cards example is a nice one. It may even be a fruitful exercise to think of what pains you have and then see if there's a small community with similar problems. It's ok to be wild at first. e.g: "What if you solved the problem of helping senior citizens' find dancing lessons?"