I was a piker and just hit the delete button without doing any of these things. Did I lose some history that, in retrospect, I might have wanted to revisit...honestly, no! I never went back and visited my old posts and (and I'm embarrassed to admit this), none of them were likely to have any value to future generations.
Some people post great, information rich posts about how to debug .NET applications or defuse nuclear weapons. I think my greatest contribution to Reddit was making a pun that once got 54 likes.
The important thing to remember is to delete your Reddit account (and hope that AskHistorians comes to the Fediverse eventually!).