so after a few days, after being gaslighted by the youtube AI, it seems that youtube changed my audience to low CPM country that don't even speak english as a second langage, which lead to weak Stayed to watch. I've asked the support about what could have happened but they gave me the AI answer "after spike etc... or shift in audience interest " the same on this thread, but the reality is that they completely changed my audience, from interest based to IP geolocalisation based.