if you have approved PERM, then you can renew another year each time. if you have approved 140, then you can renew another three year each time. if you have approved 485, then ... you don't need to renew H1B any more. Clear? You can do PP to speed up your 140 in case it takes too long time. if it's rejected (though i think it's impossible in your case), you should try your employer and start PERM as soon as possible.