I don't think you're one hit away. I'm a nobody, but I'll still leave my two cents.
Your videos are stellar. You're up there with the pros. That's granted.
But, there's nothing making you stand out. And by that I mean, the way you talk. Have a look around the largest channels, and notice how they talk. How they act...
There's always something uncommon to their characters. And I don't mean it in a good, nor a bad way. Just, uncommon. A little quirk that you probably won't notice if you're not looking for it. Maybe it's their wording, maybe the pauses between the words, or the tone shifts between words, or the body movement, etc etc....
That's it. That slight variance in personality from the more common person. That's what I feel you should work on.