I had a serving limit last year. I stopped buying traffic, focused on organic visitors, and after a few weeks the limit was removed automatically.
 
Mine disappeared after about a month. I didn't contact support—I just continued publishing quality content and waited.
 
One thing that helped me was removing a few pages that had unusually high bounce rates. I can't say it was the reason, but my account recovered afterward.
 
I experienced this once. My advice is to review your traffic sources carefully and make sure everything is legitimate.
 
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