The answer (IMO) is to open another channel and announce it so people can migrate. And start using more the other channels, using each time FB/X a little less, until (almost) everyone has left FB/X.
That's one thing that should be upgraded. There has to be a way to link your accounts in Lemmy, PixelFed, Mastodon, ... so "follow" becomes "follow with" and choose the service.
Stalin was not the best example of Marxism. Stalin was a megalomaniac that killed a political rival that wasn't a threat just because he once was a threat.
My wife had a crosslink in one eye and she is really happy with it. Except for the first days (pain killers).