Generally speaking I would suggest if creating new ones to avoid very big instances, since those are currently a bit overloaded and struggling to get the content across to other instances. Prime instance of this is lemmy.ml where it can take multiple hours if ever for content to catch up.
For some reason Kbin won't let me find and subscribe to most of the Lemmy communities there.
Atm this one appears in the "Random" placeholder, so it seems like a federation issue unfortunately 😔