Another approach is build a community around a topic. This is very open ended and could be a mailing list, a subreddit, a slack channel etc. Once you have done

Another approach is build a community around a topic. This is very open ended and could be a mailing list, a subreddit, a slack channel etc. Once you have done this, you might find out about people's problems. As the lead of the community you might get more insight into this than anyone else.