Hello,
The video has to be captivating and attractive. Retention observed your videos, the first 7-15 seconds is the key, if users do not leave there, means that your video is hook!
A video without a call to action is useless. What do you want your audience when you see the video? Tell you! You must include a call to action directly and specifically, whether subscribe, write a review, and another video ... whatever, but you should have it.
I didn't find the right solution from the internet.
References:
https://forumweb.hosting/12008-tips-for-success-on-youtube.html
https://blog.advids.co/20-excellent-whiteboard-video-animation-examples/
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