J1 waiver approval and cancellation

Hi all,

I am a physician and was approved J1 waiver by DoS but still pending at USCIS. I was supposed to start my job from Aug 1st 2018 provided waiver was approved by USCIS and H1b approved as well. However, my employer called last week and cancelled my job with some reason. I still have pending waiver at USCIS.

My question is:

1. Can I change my status to J2 even though my waiver is approved? If yes, then Will I be allowed to apply for waiver again for next year? Or I can apply for waiver only one time which I already did.

Thanks, Appreciate your help.