[joefarish]

If people are looking to find more niche subreddits related to their other interests I've found this page https://anvaka.github.io/sayit/ to be quite useful.

[mopierotti]

I've also found this one to be useful. Sometimes this site will give better results than the other and vice-versa. https://subredditstats.com/subreddit-user-overlaps/