Fandoms are an eternal struggle for me pretty much. Most of what I'm interested in a roleplay-sense are extremely niche in RP-circles as far as I've seen, and in those rare cases I do get nibbles on they usually turn out to be OC x CC-plays which I generally won't do. Have started to flex on this on some fandoms to even get the slight chance of getting some fandom-cravings fulfilled.
Usually the most mainstream of anime and games on my list are the ones that thrive when focusing on fandom searches for obvious reasons, but there's only so many RPs I want to do based on same fandoms (the reason why I have excluded Genshin, Star Rail and Naruto from my fandom-list, and will probably exclude a handful of shounen-titles in the future).