You have good articles and also you are here for more than 1 year so there is no reason for withdrawal. But this happens often to most of the people. I have also faced the same problem. What I have done is applying again and again. After 8 submissions i got a hosted adsense account(Same as normal adsense account but cannot be used for websites). In the mean time you can write some more articles.
So i suggest you to apply again and again till you reach your goal.