Facelift after Ultherapy and Sculptra to correct the volume loss?

I would highly recommend considering fat grafting. I would go see a board-certified plastic surgeon (with 6 year integrated plastic surgery training and 1 year The Aesthetic Society accredited fellowship). Without an evaluation in person, it is difficult to make any recommendations or provide a plan.

Volume light not be your problem . If you have sagging then the skin is too loose and needs to be tightened. Photographs would really help considerably in evaluating your situation.

Ultherapy and Sculptra are most commonly subcutaneous procedures.
Age related volume loss is a facial skeletal problem and therefore should be, and has been, performed at the skeletal level for 25+ years with long lasting and highly natural aesthetic results
Any scarring in the subcutaneous level should be examined and can be ameliorated with rejuvenative procedures, options involving stems cells or energy based procedures
Hope this helps