Let me know the from which area are you getting your most of the traffic?

You need to have content for a niche that has high CPC to be paid by the advertiser so that you in turn get a higher share of the CPC. Insurance related ads e.g. have a very high CPC, so if you get into that niche, you'll earn higher CPC.

try UK market

You need to focus on foreign people to increase your CPC rates.