as my blog are already optimized as per the opinions of DP members, still the income fluctuates to $1-$5 per day, any more improvements you look in my blog, kindly suggest if someone feels any necessary change in my ad size or placement. thanks link in signature
This kind of fluctuate in earning could be a sign of some low quality advertisers are being displayed on your web pages. I would recommend you do filter some low quality out and let only quality ones to being displayed. Most of low quality ones are tend to drive as many traffics as possible while pay at least at possible in the same way.
imo,if you want to earn more with google adsense,you should have more and more traffics.So i think you should make your site have a good rank on google.