Do you mean the cpc is low? or, the overall income is low..? If overall income is low, you need more content, more traffic which equates to more income.. Remember, the keywords which fetch you organic traffic are going to generate decent CPC.
Have you tried getting more traffic with social networking sites like twitter and facebook... This seems to be working well for a lot of people.
It seems like you know what you need to do (increase traffic). Thing is, it doesn't seem to be working. So maybe start small with less competitive keywords. If you are chasing $$$ right from the start you won't last long in this business.
If you are chasing competitive keywords, then it will take time to get them ranked.. If you need to rank them quick, you will need to put a lot of efforts in SEO. And, now with the volatility in G rankings with the recent Penguin attack, you must make sure you do right SEO. Again, as fellow members indicated, get some social traffic as well. If you are going to put consistent efforts, I am sure you will soon see increased earnings.
if you want to increase your earnings from adsense you should have proper sense of placing ads at ur website and also try to rise up traffic quantity
Increasing the traffic to your site will probably be your best bet. Trying to rank higher in google search could definitely help with traffic. Depending on the target keywords and content of your site though. Also placement of your ads on your pages, to where people will be more likely to click. In your adsense settings you can also block certain types of ads as well. Blocking certain types of ads that don't get enough clicks. Simply log into your adsense account, and check out the "Allow & Block Ads" tab.
include content data to attract web traffic toward your website and kindly use unique content data otherwise your account will be blocked/banned
try targeted pop under traffic - we have a lot of digital point clients who send traffic to their adsense page with great results check out the link in my signature for more info!
Try to make a good keyword that have low competition but higher search. Always look the cpc of the keyword. If the cpc is low for the keyword your income will be low.