'After changing AdMob mediation settings, Impressions extremely falling

At first I was using Audience Network for Bidding. Then few days ago I added Audience Network as Waterfall mediation. But Immediately after adding Waterfall mediation I was only getting Audience Network ad no google ad. None of my app user was getting any google ad other then Audience Network ad. Because of that 2 days ago I decided to remove all mediation and only use Admob ad. So I have removed all mediation from all of my ad unit. But since then still now I have very very low Impressions. Before It was more then 3K admob Impressions/day but now It has only around 250 Impressions/day (same amount of Requests). enter image description here



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