Your employer can pursue appeal or MTR towards cap exemption

Are you also maintaining R-1 status and/ or wish to maintain it?

Get an advisory from an immigration attorney. That should suffice.

We recommend every new employer initiate the GC process and there is no guarantee the old employer will support the adjustment filing.

Most RFE(s) are in a template format and so it will come down to what was submitted and what was overlooked to be added in the packet.

To apply you will need to affirm to US domicile. Accordingly you will have to reside in the U.S.

You seem to be the eligibility requirements, your employer can apply

You can perform any legitimate business activity. The structure of the organization will depend on the nature of the business.

You do not withdraw another's application.

Not sure if your PD was current during this wait or had retrogressed at some point. Further analysis is required.