I enjoy
Historia Civilis which focuses on Roman History and ancient battles and wars. If you like that stuff, it is fascinating to listen to and learn some new stuff.
I also like
Regular Car foley for their car reviews and Roman's history essays. They don't review all the shiny new cars, they review... regular cars. They are very thoughtful in their writing, but also very immature at times. Great verbal essays. If you want some of my fav vids that make you think, please let me know and i will share some.
Otherwise I don't actually follow people on Youtube. I just stumble upon stuff. I don't wait for updates or even look at notifications.