Haven't installed them yet, but my plan is:

Get (yet another) data export through Reddit's official GDPR request (have patience, they are bombarded with these requests now; in March it was instant, now you get them in a week); format it kind of useless (but machine readable), with links to Reddit posts, etc
Use Redacted to first export the data without actual deletion (if possible), just to have my data in multiple formats
Use PowerDeleteSuite to first edit / overwrite my comments and posts (selectively, I might leave some helpful, general ones); you will get yet another original data export at the end, and by what I understood it's in a readable user-friendly format
Maybe use PowerDeleteSuite again to delete / wipe everything closer to the 30th
If I'm unsatisfied, file a GDPR deletion request to Reddit (purge from backups too) in the future (when 3rd party deletion tools won't work anymore due to the APIs going down)
From them on, maybe I'll acces Reddit more rarely anonymously / without an account via old.reddit.com