When I go search for communities I pretty much never get results even if I know certain communities exist. I think the search is only searching the titles maybe? Needs to search the description at least and have fairly loose matching results. Otherwise it’ll come to a point where you have to slog through lists and lists and lists.
I go here https://browse.feddit.de/ I have no idea if its better or anything about it but someone else made a post about this and had this link in there and said it should be everywhere. As far as I can tell its a good way to find communities, I’ve found a bunch in there.