NewPipe is a YouTube client that does not use any Google-dependent library or YouTube API. The application only analyzes YouTube itself to get the necessary information. This mainly means that you can use this application on any device, even those that don't have Google services installed. The downside is that you can't log in with your Google/YouTube account, so you'd have to export/import your subscriptions.
NewPipe is very lightweight, has a built-in ad-blocker, and supports downloading videos and playing them in the background. And if you miss SponsorBlock, there's even a NewPipe fork that has this built-in.