I did this also, but then read that because loads of subreddits are dark our comments don't get deleted from them!! Should've waited until the subreddits were back in hindsight, but ahh well is a little late for me now as my account is gone.

This is the way IMO. Nuke your posts first, then delete your account.

Also helps if you had, in your younger days perhaps, posted any PII on reddit that you've now forgotten about.