CuriosityStream [0] has non-fiction documentaries on a broad range of subjects that can be educational, and is relatively cheaper than similar services. I have been a subscriber for a few years, and it's easy to default to it over YouTube, when you feel you're watching too much of YouTube and not really getting much in return.

I've also heard good things about The Great Courses Plus [1], but have not tried them out yet.

[0]: https://curiositystream.com/categories

[1]: https://www.wondrium.com/the-great-courses-plus