Here’s my two sats:
I know nothing about Youtube SEO. But I do know that SEO is VERY important when you are trying to get views. No matter if it’s Youtube, Google, Facebook, or whatever. So, I am not sure that “the problem” is the actual content.
For example, you look like a normal human being in your Youtube video thumbnails. Vast majority of the successful Youtubers look totally retarded. Take a look at the Ivan on Tech Youtube channel thumbnails:
https://www.youtube.com/@IvanOnTech/streams
In every thumbnail Ivan looks like somebody just inserted a candle into his rectum. Without his permission. When it comes to thumbnails and Youtube SEO, I think this tactic clearly works.
I am not saying that you should copy his thumbnail tactic. Perhaps you simply don’t want to look like that. Or perhaps you want to choose a platform that, unlike Youtube, does not reward madness like that.