This userscript removes YouTube's homepage and suggested videos.

youtube-minimalism.js

// ==UserScript==
// @name Youtube minimalism
// @namespace https://churchman.nl/
// @match https://*.youtube.com/*
// @grant none
// ==/UserScript==
function del(selectors) {
  selectors.forEach((selector) => {
    const ele = document.querySelector(selector);
    if (ele) {
      ele.parentNode.removeChild(ele);
    }
  });
}

setInterval(function() {
  del([
    'ytd-browse[page-subtype="home"]',
    '.html5-endscreen',
    '.ytp-ce-element',
    '.ytp-ce-covering-overlay',
    '.ytp-ce-element-shadow',
    '.ytp-ce-covering-image',
    '.ytp-ce-expanding-image',
    '.ytp-ce-element.ytp-ce-video.ytp-ce-element-show',
    '.ytp-ce-element.ytp-ce-channel.ytp-ce-channel-this',
    '.ytp-pause-overlay',
    '#secondary'
  ]);
}, 250);