I enjoy deleting my old posts and comments, but it’s lot of work doing it individually, especially with comments. For other platforms there are apps you can login with, then delete old or all content, but I can’t find one for Lemmy. Does such a thing even exist?
Might not be for you.
Maybe as an alternative for you: create new accounts after one year or so to not leave a years-long data trail? This way your posts are preserved but can’t be connected easily to each other to doxx you.