Infraorbital nerve damage 6 years ago. What can I do about this?

One of the procedures currently available for nerve reconstruction involves microsurgery, it is a procedure called cross-face nerve grafting, a technique that uses a nerve branch from the contralateral side of the face (intact infra-orbital nerve), "connected" to a nerve graft and coapted to the damaged nerve. I recommend having a consultation with a Board Certified Plastic and Reconstructive Surgeon with expertise in Microsurgical procedures.

It has been a long time since this injury and any efforts at nerve recovery are probably slim. But intraoral nerve decompression with a wrapped around fat graft would be the approach to take to see if any further improvement is possible.