https://freetubeapp.io and available as verified flatpak : https://flathub.org/apps/io.freetubeapp.FreeTube
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I'd recommend FreeTube.
It has its own backend, but it can also use Invidious. As such, you can also run NewLeaf (an Invidious-compatible YouTube scraper based on the NewPipe scraper) in the background and connect to it via FreeTube, and that should work.
I would say Freetube, it's very similar to android alternatives but in Linux, can proxy your traffic trough individious' instances.. The only downside is the 1080p limitation
Why the limitation?
I used freetube a few years ago, but i dont know if the project is still active. Was a bit buggy, but acceptable for me