Someone recently asked if there was a neat way to see where all of the now broken down subreddits moved.
Some moved to Discord, some to Lemmy, and some are somewhere else.
This seems to be a good place to find your communities again: https://sub.rehab/
Some of them have multiple links listed so it doesn’t seem like a binary ‘this sub went to that instance’. There’s a ‘suggest link’ button, perhaps try using that for the lemmy.world AITA community.