Operation Razit

you need to edit your posts first – Reddit has been caught multiple times since June restoring deleted posts

Power Delete Suite can alter or delete your previous comments and posts and after that you can remove your account

After you do what others suggested, go ahead and file a GDPR request to scrape your data on reddit. That's a legally binding procedure and they have to comply.

Here's a handy guide with a not so encouraging message at the end.

I used redact.dev

I used https://github.com/ksurl/Shreddit

Here's a quick bash script in case you have multiple accounts and want to run the delete on a schedule. Run it under a dedicated service account or modify the script to use venv or pipenv.

#!/usr/bin/env bash
set -euo pipefail
cd ~ || exit $?
[[ "$PATH" =~ (^|:)'~/.local/bin'(:|$) ]] || export PATH="~/.local/bin:$PATH"
command -v shreddit > /dev/null || python3 -m pip install --user --upgrade pip Shreddit@git+https://github.com/ksurl/Shreddit.git
while read -r acct; do
  echo shreddit -u "$acct"
  shreddit -u "$acct"
done < <( sed -E '/^\[/!d; s/\[|\]//g' praw.ini )