my impressions are at 500-800 per day but my eCPM is 0 to 0.10 $

I have been using unity ads to make money for almost a year now. I had ups and downs, but my eCPM was never outright 0! That is why after 2 days in a row of eCPM of 0 and 7 days of an eCPM below 10 cents I have started to realize that something might be wrong (it also might not and I'm just not understanding something).
Can someone pls help me out to what might be causing my low eCPM? (btw the eCPM 14 days ago was over 1 $))

 

I have the same problem. It happens, my impressions are at 800-1000 per day, or even 1500, and some days an eCPM is 0.25$-0.30$. Why?

Dear Unity Technologies, why can this be? Maybe I did something wrong?
p.s. Of course, sometimes pay more. The screenshot shows the worst result, which lasted 5 days.

I apologize for my bad English language. I am from Russia.

 

There is this article on the knowledge base that might interest you, especially the comments: https://support.unity3d.com/hc/en-us/articles/205263819-How-do-I-earn-revenue-from-Unity-Ads-?