AdMob Interstitial CTR is around %0.20

Hi, I have a word game on Play Store which is somewhat popular in my country (Azerbaijan). I have placed an interstitial ad between levels and I get around 15k impressions daily. However, my “Impressions CTR” is around %0.20. Therefore, i am not making a considerable amount of money. I do not use any other network, just AdMob. What should I do in order to increase my CTR? Should I move to another ad company?

PS: You can check the app from this link.

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To increase your CTR and then, eCPM you need to put your banner on other place where the users has more possibility to do click. Try to add native Ads, sometimes it’s a good alternative in games. With these amount of impressions you could do about 10$ daily almost.