Before the APIs are shut down, if you want to wipe your reddit account, I found JavaScript-based account wiper to work quite well and is aligned with security best practices called 'PowerDelete Suite.'
Once logged into your reddit account, drag the red button to your bookmark bar and click it. That initiates the script that will work on your reddit account.
You have options to overwrite your comments before deleting them, just deleting them, downloading your data, etc. Very thorough.
Boot Script Code
javascript:
(
function()
{
window.bookmarkver = '1.4';
var isReddit = document.location.hostname.split('.').slice(-2).join('.') === 'reddit.com';
var isOverview = !! document.location.href.match(/\/overview\b/i);
if (isReddit && isOverview)
{
var cachBustUrl = 'https://raw.githubusercontent.com/j0be/PowerDeleteSuite/master/powerdeletesuite.js?' + (new Date().getDate());
`