So, if you haven't checked that one already, [email protected] has a great sticky post with recommendations! (Lemmyverse Link for instance-agnostic linking.)
From a quick glance, your content could probably fit well on https://spectra.video/ - as long as it is OC, it has a good home there. If you want to utilize automatic mirroring from YT with the built-in yt-dlp feature of PeerTube, https://peertube.wtf/ still had that one working last time I checked. (Problem there being that YT blocks IP ranges from most servers, so yt-dlp will fail to download the videos).
Lastly, I can advertise my own instance - although I am slowly reaching the point where I will have to consider not taking on more accounts, and it is still just a personal project - whereas other instances in the above list have been around for quite a while longer and are more proven on that front.