WOW this is amazing, as soon as i tested the theory above, earlier today ( 4 hours ago) i decided to start sending normal traffic to the video (5K-10K per day ) with the new retention of 1.5 Minutes - 3 Minutes so.... a short time after traffic was sent to the video, i think it wa just an hour or so, it bounced back to it's ORIGINAL ranking at #4 of the 1st page
https://imageshack.com/i/pnHFc8Jop
i never expect such a rapid change in such a short time, this is really interesting now, i sent only 1K-2K to the video in the last 4 hours, so this is a surprise to see it back in the game.
maybe it's just the activity maybe the higher retention helped, i really don't know yet, but i can tell that this minimal traffic raise the video from the deads...
https://imageshack.com/i/pm2iZGrhp
just need to figure now what is the minimal amount of non-stop traffic need to maintain this video in the current position, and what i need to do in order to improve ranking