When you say what happened to 90% -- what's the 90%? Are your views 10% of your followers? Or are your reads down 90%?
I have a very modest following < 200, so I can't really compare my situation with yours. My Reads - which is what pays -- are down a bit from a few months ago, even though I continue to publish articles and gain followers.
For me I know I'm reading on Medium less now than I was 2 months ago. Just too busy with holiday stuff.