You could always just go to beehaw.org or lemmy.world directly and register a new acc there, and still subscribe to all the same communities. You don't actually lose anything that matters by signing up elsewhere. Even your own post history on your lemmy.ml account can be viewed by just going to lemmy.ml to log in again, if it matters to you.

In fact, signing up to a moderately-sized instance like lemmy.world may also be good for your usage; lemmy.ml is being slammed by incoming users, so anybody using it (even if they're viewing other instances' communities) feel the chug. If it goes down, all of Lemmy is inaccessible to you.

But if you're on a different, smaller instance, then you can continue ticking over while the behemoths are struggling by staying in shallow waters until they recover from the server load. A moderately-sized instance is more likely to get ongoing support than a small, newer one is; and less likely to time out or be hugged to death than a larger one is.