After all your document complete ....
dont forget also the "X Factor" in US Embassy consular.
It doesnt matter if u have a lots of money and u're so convincing to them, but if they feel u're not illegible to visit the US , they will just give a "No" for an answer...
Other than that just pray for it ...coz that the only thing u can do ......Pray hard, really, really hard.....