To do this with the current link structure use this script:

// ==UserScript==
// @name         YouTube Channel Homepage Redirect to Videos
// @version      1.0
// @description  Redirects YouTube channel homepages to the Videos tab
// @author       You
// @match        https://www.youtube.com/@*
// @match        https://www.youtube.com/c/*
// @match        https://www.youtube.com/user/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

     if (/^https:\/\/www\.youtube\.com\/(c|user|@)[^\/]+\/?$/.test(window.location.href)) {
        window.location.href = window.location.href + "/videos";
    }
})();