This is one reason that I think many people should consider running their own single-user instance or tiny instances for close friends/family.
One of the problems with centralization is literally the fact that this can happen. The more small servers the fedi is comprised of, the stronger it is. There are also a huge number of benefits to this configuration on an individual level as well.
EDIT: Re: importing/exporting your old account is, unfortunately, a thing that cannot be done currently. I’m happy to be corrected on that, though.
If it’s ever something you want to try, it’s one of the easier servers to self host and there’s a lot of helpful resources out there. There really isn’t any coding involved outside of editing a few configuration files unless you want there to be.