The genioplasty doesn't seem to help much. First do you have deep bite/overbite? if not. Do your parents have the sagging? Nothing beats surgery in cases like this. I'd recommend sharing side ,profile pictures. But mentoplasty could help. That genio did not do much because it only adressed the small area of the tip of the chin. Look into Garcia y Sanchez mentoplasty or mentoplasty in general. Might help. Try eating harder foods for lower jaw.