I use this https://returnyoutubedislike.com/ . But from another comment it looks like these addons use their own database... It has helped me so far.

Apart from this if you want to turn off recommended videos and comments and hide your front page from displaying anything except the search bar, you can use the following filters on ublock origin. I have enabled/disabled according to my needs. I've included the source comment as well if you want to explore more.

I've noticed that I now only search what I need and that helps with my productivity.

  # https://news.ycombinator.com/item?id=21026069

  # this is for blocking home page thumbnails videos
  youtube.com##ytd-browse[page-subtype='home']

  youtube.com##ytd-watch-next-secondary-results-renderer
  youtube.com##app-drawer
  youtube.com##ytd-item-section-renderer.ytd-comments

  # side hamburger menu all details
  #youtube.com##ytd-guide-renderer

  # side home/subscription etc icons
  youtube.com##ytd-mini-guide-renderer

  youtube.com##ytd-topbar-menu-button-renderer
  youtube.com###buttons.ytd-masthead

  # hamburger menu
  #youtube.com##yt-icon-button

  youtube.com##.ytp-endscreen-content

  # https://news.ycombinator.com/item?id=24506515

  #    youtube.com##.ytp-suggestions
  #    youtube.com##.ytp-pause-overlay
  #    youtube.com##.videowall-endscreen
  #    youtube.com###related
  #    youtube.com##ytd-browse[page-subtype="home"]