Do not try 2nd doctorate. Five years in postdoc position can make more
publications than those in doctorate program. The overall ranking of you
current school has nothing to do with your career. How is your postdoc
adviser? If he is a big figure, you will have good opportunity. J-1 visa is
not scary. My office mate was sponsored by his government in his Ph.D. study
, and recently got waiver bypassing the NOL. In summary, find a good boss
and lab. for your postdoc if you are looking for a faculty