[Marsymars]

You can self-host Invidious and connect to it with yattee. (The UI is… not the best, but it’s generally functional, and better than ads.)

[BLKNSLVR]

There's also an app called Clipious on F-Droid that can connect to an Invidious instance.

I don't use it much since I started using the ReVanced patched YouTube app, but it used to work well enough for casual usage.