One year old hitraffic blog but not good rank

[raymail]

Hello Friends,
I am getting daily 500 to 700 unique visitors from google, etc. all visitors are from all over the world, including russia and china, my blog has good back links and i daily update it. Still that blog has alexa rank 3,93,000 and one of my blog which i update weekly or some times monthly, that blog has alexa rank 96,000. Than what's problem here with my alexa rank?