You can try Millennial, but dont be surprised if you see it generates like 1/20th of what Admob generates. I think better focus on reaching more audience.
It would be great if you could actually see what the ads were for, that were getting you most clicks. That way it would be easier to see if a certain advertisers campaign has come to an end or at least your allocation of those ad slots. I'm not sure if this possible tho. I get the same ads showing time and again in my apps and notice a drop off when they end. But if your app is good for certain type of ad your revenue will be up again real soon.
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I think better focus on reaching more audience.
For the past 4 days I had no revenue showing. Now it's showing them - sometimes this happens with admob I've seen it at least 3 times.