What happened to YouTube ads?

Question

YouTube

Colleagues! For a long time I tried to understand what was the matter, but despaired, and decided to resort to the help of the collective mind.
Does anyone know why YouTube could set me up like this? There was and is advertising in my videos. The video already got a million views. And then suddenly bam - income drops sharply. Subscribers and views are growing, I don’t use any black methods of promotion, there are no bots ...
Does anyone know where to look for reasons, how to find out from YouTube why such heavenly punishments?
I haven’t read anything already - and spam in comments is possible, and the use of an ad blocker at home, and even if you yourself clicked on an ad in a video, they just don’t write ...

Thank you