Great suggestion !

Navigate in the community session and search through hundreds of non-political one; Hobbies, books, tv series, anime, movie, ecc. You can also use this lemmy explorer site : https://lemmyverse.net/

About that, the "Communities" page on Piefed has a counter of weekly active users, so you can use that to find active communities. There are also feeds on https://piefed.social/feeds that can help find communities on a specific topic, and can be subscribed from other instances