No, I meant lock as in disable login, remove email address, 2FA and freeze all content. This feature might not yet exist in lemmy but it probably should be implemented. Apart from a user leaving this might actually be required to properly handle a user passing away.
OK, then I just wait and stop using this account until such feature gets implemented. Deletion is not an option as it would also delete all posts/comments. At least local ones, maybe even posts/comments on other instances. Dunno, if the User/Delete Activity is propagated to other instances (yet).
Bye and Thanks for all your hard work!