(Full disclosure: I made one of the tools)
cross-posted from: https://lemmy.ca/post/1292268
lemmy.world cross-post link: https://lemmy.world/post/1251192
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
I would if down the line an export option will be natively available by lemmy or kbin like how you can import and export bookmarks files.