This is a temporary workaround. The federation is probably screwed anyway, so there's no point in posting any new content there, but it's good enough to back up your subscriptions or posts.
If you are comfortable with using command line stuff, I found this little Python script perfect for my needs. I copied my subscriptions from my original instance to two others:
I don't know enough programming to know whether the tool could be stealing my authentication, but my passwords are random and I don't really care if anything happens to those.
Edit: You have to run this when the servers are actually functioning. I was migrating my stuff away from my lemmy.world account because of the overloading there, and the server was pretty slow while it was copying my subscriptions. I ran it again an hour later and it picked up the few subscriptions it missed on the first pass. It's smart enough to check if the new server has a particular community subscription already in place.
Me too. I've now migrated to feddit.uk , I was lucky that I had locally cached pages for my subscriptions so I was able to replicate them, all be it manually, but at least i now have a new instance with all my subs.