Hellp Price..
Well, I agree with Srijana12. We can't renew our visa inside USA. we have to cross border like either going to mexico, canada or back to our home country. One of my frienn went two times in Mexico to renew her visa. Well she told me that the profit of going Mexico is it is faster whereas in Canada, it takes at least 1 month. I even know one of my friend's friend from Texas, Dallas got deported from Canada when he went to renew visa. So, I would suggest going back to Nepal for renewing your visa. But if you have done some activities like selling alcohol to minor or driving under influence of alcohol, I would suggest not to cross border.
Hope this all helps you to figure out...