This should solve that when it gets implemented.
There’s not a good way to control what content I see. It’s essentially either “everything” or “a single community”. On Reddit, you could already have multiple communities about the same topic on Reddit, but usually one was dominant, and you had multireddits to save you if there truly are a few good related subreddits. Now on Lemmy, you multiply that problem by N instances, and subtract the multireddit feature. This situation simply must be made better somehow.
https://github.com/LemmyNet/lemmy/issues/3071#issuecomment-1653885992