Do you know this?

I have a crippling inability to understand YouTube and I sit and look at analytics trying to understand what's going on and one thing I know is that my regular viewers aren't getting a notification of my channel
However I want to understand this specific thing and I need someone to explain it to me like one would to a single cell organism
What on earth does this mean and imply?
If you know please tell us
Because I have watched this steadily go down and each time it's low the video gets a beating.
When it's high the video does relatively better.