Same thing happened to me today. I didn’t do too much proposal either. They said I made too many proposal without landing any clients. But I did a few proposal, the clients didn’t award the job to anyone, so that’s not my fault. And I was also actively in contact with two clients who assured me that they will award me the job within a couple of days.
I had a very good rating, good job success rate, most of the time I was around 80% to 95% success rate at upwork. I do not take or apply to job unless I am sure that I can deliver quality work.
All in all, it is really confusing and frustrating.