DSO will not fix until revocation notice is received by USCIS. Best is to have a new employer petition.

Status is sought for reinstatement, visa not.

Amendment is required to be timely filed irrespective of pending status of earlier petition

Whether an amendment is required or not, is for an employer to consider. Accordingly reach out to employer and their attorney

Formally abandon residency and apply for non immigrant visa.

Retain an attorney to figure out which petition is pending and which is denied.

If they are willing to issue new I-20 you may be able to complete your studies. Discuss the process with an a immigration attorney

COS must be sought prior to expiration of grace period assuming it is within authorized period of stay

Attorney fees are not discussed on Q&A. You can call a few attorneys and get their quotes directly. Good luck!

Employer can petition for EB-3 skilled worker as Assistant Chef.