Sure: don't use Mastodon to participate in Lemmy communities.
You can of course, which you clearly already know. Tagging a community in s top-level post even results in a good experience, but subscribing to communities does not, and you can't vote.
I feel like it's important to say that kind isn't dead in the there's no people in communities point of view. It's dead as in it has far more down time than up time.