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After that period I noticed significant drop down in my earnings (during last month)
I tried to change ad formats, placement, colors but nothing helps. So what you can suggest to do in this situation. Here is my point of view:
The main reason I see is that blog readers just have adopted to adsense and don't click on ads because now they know that this is advertising links and now they concetrate mostly on blog content. Now I am placing adsense in content section but they still don't click on it while adsense banners are related to published content.
Another possible reason is that Google don't identify clicks from the same I.P. during one month for example. I have 85% of return visitors and this may count as I think too. What is your experience? have you seen any signs of this theory on your blog or site?
I know that I need fresh traffic but currently I want to understand what is the possible reason of such drop down and how to improve AdSense earnings working with this audience?