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Are you using a single ad network for app monetization?
It is better to use multiple ad networks for app monetization. Partners such as AdPumb, Appodeal and Appolovin are some of the good app monetization platforms.
By integrating multiple ad networks, you can make a balance in the ad revenue. That means you can tally a low ad revenue from a network with a high-earning ad network.
Moreover, you can do A/B test to find the best ad networks for you.