Revanced instructions (official Youtube app, but with adblocking, sponsorblock and other nice improvements).

0. Uninstall Youtube (or disable if not possible)
1. https://github.com/ReVanced/revanced-manager/releases
2. Install
3. Open, go to “Patcher”, find “Youtube” and download the specified recommended version from https://www.apkmirror.com/
4. Patch it, install it.
5. Install MicroG if you want to use your Google account with it: https://github.com/TeamVanced/VancedMicroG/releases
6. Launch your installed youtube app. You will need to login from within the app if you are using MicroG.