I’ve seen a few comments in the other thread about community centrization
Your following, blocking, muting, and domain-blocking lists can be imported at Settings > Import, where they can either be merged or overwritten.
Mastodon currently does not support importing posts or media due to technical limitations
https://docs.joinmastodon.org/user/moving/#export
Seems pretty similar to the way we manage it with Lemmy at the moment (settings menu, export JSON, import JSON), am I missing something?
There’s a bit more on Mastodon then Lemmy - https://docs.joinmastodon.org/user/moving/#migration has the details. But not being able to move posts is a big limitation. And even the functionality that’s implemented has some unpleasant surprises – see https://erinkissane.com/notes-from-a-mastodon-migration