With the vlemmy situation ongoing, i feel like it would be useful to put this here (i did not make either of these tools)
Lemmy Account Settings Instance Migrator (LASIM) copies all your subscribed communities and blocks and lets you upload them to another account, in just a few clicks
lemmy-migrate does the same thing but without a GUI and support for uploading your backup to multiple accounts at once
This sort of stuff is crucial and needs to be built in.
Most instances are one user’s whim away from going away. This isn’t a problem as long as clients back things up and migration is easy. But, that doesn’t happen right now.
Guarantee we’ll see some big news at points in the future when a big instance goes down because the owner died or just lost interest.
Again, these are easily overcome, but they are issues right now.