I used Power Delete Suite but with the API changes it may not work anymore.
Seemed to work fine when I ran this recently.
It doesn't rely on the API, but it does rely on old.reddit.com. I expect this will be disabled in the near future as well.
Keep in mind they will bring some stuff back, slowly and sneakily, so my advice is keep the account for a while so you can keep an eye on (and control over) your stuff. If youre in the EU send them an email gdpr request to delete your data. When they invevitably reply with the copy pasted "click this link to read about how you can delete your posts and comments" simply answer back that it is legally their responsibility to do it and youre not doing shit. Tell them if they dont comply you will be lodging a formal complain with your country's data protection officer (again, if youre in the EU), as I did when they brought back some deleted content for the third time.
Redact on desktop worked fine a month or two ago, I imagine the API changes have caught it out though.
If you are in eu or California, then best way is https://thomashunter.name/posts/2023-06-19-how-to-delete-reddit-account-gdpr-ccpa
Reddit Mass Delete browser bookmark still works, but it takes several hours.
The only way I've found to reliably delete a huge amount of comments and posts is to do a GDPR request for your data, extract the resulting zip file and then use the free shreddit utility to delete your data. The utility has an option where you can point it to the extracted GDPR data, and it will handle everything.
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