Some Peertube instances useful for English speakers:

https://peertube.nielsemmer.com/videos/local?a-state=42 Documentaries, scitech talks, a few explanatory videos

https://tilvids.com/ Varied. 'Fun facts' videos, educational, cooking, mythology, music, ...

https://peerkids.com/videos/trending?a-state=42 Peertube for kids - cartoons, education stuff from TEDEd, PBS, etc. that look fun and well-made

https://peertube.opencloud.lu/videos/overview Privacy, how-to videos, conference talks

https://share.tube/videos/most-liked?a-state=42 Tech reviews and opinions, FOSS tools, gaming, etc.

https://v.pfaff.dev/videos/most-liked?a-state=42 Tech tool reviews, privacy

https://conf.tube/ Conference talks

(I collected these some time back in response to someone asking for this, appropriately enough, on Mastodon.)