It has been almost a year after getting 3500 grafts and my frontal density is poor what should I do?

I would have expected more frontal density, as well, based upon your Class 3 pattern with a strong front forelock and 3,500 grafts. Actually I think that 3500 grafts were actually an excessive number of grafts for that area. You and your doctor established expectations when the surgery was done, so go back and review these expectations with your doctor. I would have expected more density but some of the grafts may not have grown causing the reduced density you are seeing.