Is it possible to reverse a subperiosteal midface lift?

A true reversal is truly impossible; revisional surgery is always an option. consult with an experienced facelift specialist to discuss your concerns after an in-person examination. The procedures will likely be different from the first surgery. Wait a full year before your second surgery.

Without pictures and personal exam it is hard to tell the underlying cause/s of your problem, which will determine the type of revisions you will need.  While improvements can be done, sometimes it would be limited since another aggressive approach could aggravate the distorted appearance and lead to more scarring.If too much skin has been removed or the appearance is overly tight, sometimes the best course of action is to wait for the skin to relax, which could take a couple of years. Make sure that you choose a facial plastic surgeon (board-certified, of course) who regularly performs revision facelifts or corrective surgeries for botched results.  You can assess his level of skills by looking at his before-and-after photos. I hope that helps and good luck.