In your account settings page, there's a section for importing and exporting your user account:

Exporting it will give you a JSON file that contains your favorited posts/comments, community subscriptions/block, user blocks, and instance blocks.

That file can then be imported into any other Lemmy (or even Piefed! It's compatible ^^) instance, bringing all those things with you :)

The only thing that cannot be exported are your own comments and posts.

Also @SCmSTR@lemmy.blahaj.zone