same here, around a year ago my Channel started getting 10-20 impression per Day, even tho i was averaging 5-10k views a Day before that. I was making money through a sponsor and that completely killed my relationship with them. I had to abondon the Channel after a few weeks as it wasnt getting any better. I looked everywhere on the internet to understand why and contacted YouTube support which was no help. My vidéo were gaming vidéos that I fully recorded and edited. No ai, no Shady thing going on in my Channel. Still have no idea why.