The search in Jerboa is…limited. It searches on community name(not display name) and it will only show about a dozen of the largest communities as results and nothing more. You essentially need to already know what you’re looking for to find a great deal of value from it.

You really have to search for communities externally if you’re looking for something that isn’t a niche interest. There’s a small handful of directory sites that help with this, but I can’t for the life of me remember them at the moment if someone can help me out 😅

Edit: Mentaledge beat me too it. Lemmyverse.net is the largest of them.