Check out PowerDeleteSuite, a Chrome* plugin that can edit/delete posts in a user’s history. https://github.com/j0be/PowerDeleteSuite

Just follow the install instructions on the page and let it rip. You can act on or exempt specific subs, act on age, exempt by status, etc. It will also export deleted and modified comments to a CSV for your own use.

I nuked my accounts, editing all comments to “This comment has been deleted in protest of the Reddit API changes of June 2023. Consider visiting Lemmy.world or Kbin.social for an alternative news source.”

I’ll probably go back in on the 29th or 30th and delete everything before closing the accounts.

• worked on Chromium for me. Never had success with Firefox, and I don’t touch Edge.

(Disclaimer: I have no affiliation with this project)