One of the things I used violentmonkey for was to redirect any reddit url to the old reddit.

Example

// ==UserScript==
// @name        Old reddit redirect
// @namespace   Violentmonkey Scripts
// @match       https://www.reddit.com/*
// @grant       none
// @version     1.0
// @author      -
// @description 10/8/2022, 8:20:18 PM
// ==/UserScript==

var str = window.location.href;
window.location.replace(str.replace("www.reddit.com", "old.reddit.com"));