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
Thanks @[email protected] ! The export worked well (ran LASIM on Windows), and the JSON file contains my followed communities and profile settings. Wish I had this prior to the Vlemmy outage 🤕