How to Improve Admob ecpm

Hi my admob ecpm down each and every month. Last year same time i am get ecpm from $1.3 to $1.7. now i am getting only $0.3 to $0.4. but i have good impression. How to improve ecpm please give any ideas.

I think the reason behind low eCPM is the country your users are in, as well as the type of device they are on (low end/high end)? You usually get that low eCPM if the users are in the third world.

Country are changed that’s why might be.Also when your app get lot of downloads like more than 1m then your ecpm will increase automatically(huge change as advertiser like to pay more).

Thank for the idea. How to Promote apps in Particular countries like USA, UK, Canada etc