What can be done to correct the appearance of sunken cleavage area after LD Flap reconstruction? (photos)

Hi can anyone help with my situation. I had expander with mastectomy for breast cancer recurrance iand previously had radiotheraphy in 2017. Then it was decided to do the LD flap and implant togethet last November. When I saw it at 1st it looked really flat and wide under the arm. It has gone down under the arm but now still out a bit, wide looking and sunk in cleavage area. Expansion was 450cc and implant used is mentor 300cc, CPG 311. It looks too wide and flat.