Classical music and documentaries
Check the ratings, whichever magazine or website you choose: Classical music and documentary films almost always get more stars and higher ratings than pop music and feature films.
The reason is simple: The folks who like stuff like that like stuff like that.
The smallest viable audience for certain genres is very clear. That allows the creators of the work to be specific and to deliver on expectations.
The broader you seek to make your offering, the more likely you are to run into people who don’t care, don’t get the joke or are simply not open to being satisfied.
It’s not easy to record a symphony or edit Restrepo. But your work is more likely to pay off in audience satisfaction.