Reddit is actively restoring deleted comments and posts. Deleting your account won’t make any useful difference. Instead:
- Keep the account around but use some tool to delete all comments and posts everyday. I use Redact app on Android but there’re many others. Reddit would not be restoring comments and posts if they are not useful to them. By keeping your profile and keep deleting everything, you are denying Reddit any chance from making use of your data.
- Monitor when subreddit opens poll for re-opening and vote the “best” option.
Just want to mention that all you can do is delete/replace the content that is shown on the website. The content you originally posted, including all edits, are most likely stored in a database anyways. You will not be able to prevent reddit from using your data to feed an AI.