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?