If you're a European citizen, nothing Reddit does can remove your right to be forgotten.

If you're a citizen of a lot of other places, your government doesn't enforce that right.

Your best bet is probably contacting them. This can be done on this support page. Select 'Inquiries Related to Your Privacy Rights' and then under 'What do you need assistsce with?', go with 'Request account deletion/deactivation'. Hope this helps!

I asked for my data to run shreddit on everything several months back and they never got back to me (I'm ip banned). I think I'll send an email to their legal contact

How does this work? How is it not possible to delete the other accounts? If it's an IP ban, can't you circumvent that and log in to the others and delete them?

Have you tried using Redact? I just nuked my account and posts with no issue. My account was not banned, however. I like the feature that allows one to edit all comments and posts rather than just delete them. I replaced everything with a heartfelt message for u/spez...