Sir, I have a american green card, but some problems I am coming in Pakistan and living there my american visa are expired since 2 years so information please why I renew my visa, and I go back.

Normally green card is given for 10 years. So you have already been in the U.S. for many years and know the advantages and disadvantages. You must decide yourself if you want to live in the U.S. or in Pakistan.