This is odd given the views of your other videos. I could be wrong, but it could be a weird algorithm thing where YouTube maybe throttling your channel just to see if people will still watch your content without them "pushing" it.
I'm not sure where on the planet your are, but here in the northern hemisphere most channels are starting to experience the summer slumb. People are on vacation, traveling for the first time in a year because of all the craziness.
Also, have you tried asking your audience what kinds of videos they want to see via the survey on the community tab? It could be that your audience want to see something different.