Retention is a big bottleneck when people drop of after 15-20 seconds form your video, how improve this ? I don't know.
I like simple video good intro image and punchy titles and subtitles, description with chapters. Many adding a lot of slides in it don't kno whow they doing this that costs a lof of time, example; Joanna Wiebe, she has often a lot of slides in her videos maybe they doing only youtube or where they have that much time to adding funny animated slides in a video it's a lot of work !
Vidq tool or any others are not a help here because they adding unrelated slides and the more you editing each slide, the more credits it costs you.
I would keep it simple, a simple video you speak with a strong emotional punchy intro +substitles and have timeline chapters. Yes adding 2-3 related shorts to your video will help they are a booster to get much much more views. Do yt seo and add pain points of your audiences in your video and in the intro.
The other thing is local limits, means creators outside of usa will not get usa traffic, youtube will show their videos first to their small local audience they never get out of 200,300,500 views, I not have another theory for this whey many good videos not get more than 300, 500 views....
Learn from them it's not that hard; Alex Hormozi, Dan Koe, Joanna Wiebe, Alex Cottoni, watch and analyze how they structure their videos and intro.
Happy Weekend !