Title basically. I was here at the very start of it all and really enjoyed it. However I felt it lost its uniqueness within a few months of mass migration and started turning a bit like reddit again so I deleted my old account. However Reddit has only gotten much much worse since, and Lemmy has stayed about the same. So here again.
My understanding is you can’t migrate posts and comments, but you can migrate subscriptions and blocks. I’ve done it to both Lemmy and Piefed instances.