My dear, patience is the ans:
First you must ensure that your blog is full of contents, i mean unique contents, at lease 50 posting which are consistence every 2, 3 or 4 days. Frequent.
Then spend some money on cheap PPC eg: You Can get constants traffic of 500 over unique visitors here:
You blog age must be at lease 3 months old.
Your blog must be on a real niche and contents must be relevant to the niche.
Used Wordpress platform and have your own domain name.
After 3 months, you then are-apply with Google adsense, you will 100% be approved.
I am talking from my personal experience. How for years I have been trying to apply for google adsense and was always rejected because my blog or website did not meet the criteria as above.
You can learned more and see for yourself how I develop my blog from 27million tanking, now at 430k on Alexa.