1. First, make me care.
2. Then provide an indication (e.g. in the video description) giving the time in the video where the question starts to be answered.
If you make me somewhat care, but I have to binary search through your video to skip the rambling, I'm likely to back button out.
Then expand on it in increasingly advanced levels of detail.
If your knowledge is high, I won't care about the video production. If you're not getting to the point quickly, you're manipulating the audience into getting views; education and sharing knowledge isn't the main driver of your video.
But what I want is idealistic.