I took piano lessons for a few years when I was a young teen so I have some context. The reason I never continued with piano lessons is no one ever listened to my complaints or acknowledged my upsets and I gave up and dropped out of it. Why did my teachers not allow me to play certain music that I enjoyed? I was always forced to play the classics and I understand they are fundamentals but if students lose interest, fundamentals don't matter.
I would like someone to explain WHY things are the way they are done in piano playing beyond "the teacher said so".
What I am saying is that regardless of popularity, if you are a piano teacher trying to reach and grow an audience, there are certain questions and topics that should be acknowledged regardless of what any SEO scoring says.
Are you targeting your videos to the purists or a "practicalist" (someone like me who only wanted to learn to play piano for the enjoyment of it and not all the traditional recitals, etc.)
I would say there is a much larger audience for people who want to learn so they can play music they enjoy vs. those who want to be a classical pianist. Maybe create some videos of how to play some famous movie themes in a simple manner. "How to play the Star Wars theme easily on piano" would probably get some traction. "How to play the Avengers theme simply on piano"? On that one idea alone, you could leverage all the famous movies. Star Trek, Jaws, James Bond, Indiana Jones, etc.
Obviously, you would have to choose a simple arrangement without all the fancy chords with more emphasis on a simple melody arrangement. But people have a craving to easily learn how to play music on an instrument.
Then you can bring in why people should learn how to do their scales, why learning chords are important, or any other technical point you want to make. You tie the boring stuff into things people are really interested in.