Welcome to AdSense bud. We could help you more if we could see how many impressions you have on these days. Don't post your CTR thought, it is against google TOS.
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Earnings vary a lot. That's just how it is. Still, it's better than nothing. But yeah, experiment with ad positions and blending. And then start focusing your resources on other things Possibly services/products you can sell?
It like our lives, most of us have 'ups and downs' ! Unless your site is showing product/service that are getting more popular each day and with no(zero) competition, the your adsense earning can rise steadily everyday !
The earnings depend on your traffic. If the traffic is low, of course the earning is low. It also depends on your blog's ctr. You may want to revise your ad layout if the traffic is high but the earnings remain low.