I know it is a bit confusing, but request and impressions are not what make up the fill rate. You should still see about 98% fill rate even if your impressions are half of your requests. So this is basically how it works: Every time you request/pre-load an ad (like call the load method) it counts as a request. Actually showing it in your app counts as an impression.
If you are getting low impressions, but your requests are still the same it could be a problem in your implementation. Have you recently updated the app?
That being said, Admob revenue is low at the moment.
Hi ,
I was having the same problem for about a week or two but this last 2 days my CTR raised to around 1% although i’m not sure away but maybe because I tried some marketing this 2 days .