回複：Can I use premium process to apply for H1b after using EAD

Yes, you can use premium process. If your H-1b application is fully approved with I-94, you do not need to do anything. If your applcaition is approved without I-94, you need to go outside U.S. (China, Mexico or Canada) to get an H-1b visa to activate your H-1b status.
So, just wait and see.