>>34381660NTA, but I will give you a non-schizo answer
When people speak about Mori and her decline, many clamor down on her recent "yabs" as reasons why. As in, her Connor cuck debacle, her lean tweet, etc. Most will point to things of today rather than yesterday.
With Kiara however, it's the opposite. Her failures haven't spawned from her behaviors of present day, but the problems from the past. She was overly negative about many things, very pushy with numbers (Heart Challenger is a good example of this), had always tried to be more vocally present in collabs and had moments of talking over people/taking the spotlight away. Fuck, maybe some hockey fans are lurking here but the best example of that would be someone like Pierre Mcguire. For those out of the loop, he was essentially an analyst who would always speak at the wrong times and say things no one wanted to hear.
Essentially, Kiara's problems of the past filtered a lot of the EN audience and those viewers never let go. Yes Youtube is fucky and almost positively isn't showing everyone's "real" numbers, but even if they did she would still be the runt of Myth, as she was then. And those things still creep up to this day, and probably why she expressed that she doesn't care about growing her audience anymore etc.