I would start by getting CT scan of your facial bones and evaluate them against your pre operative ct scans(I'm assuming you had some). I would then start to devise custom silicone implants that would be place along the mandibular border. This will help widened the lower part of your face. Best of luck
Revision after chin surgery
Your photos unfortunately do not show profile. It looks that your chin is too long and pointed? However, without good profile photos and clinical exam it would be hard to give you good advice. You may consider temporary augmentation of lower jaw on both sides of the chin with fillers just to have an idea how would that work?
A consult with board certified plastic surgeon or oral/maxillofacial surgeon with experience in aesthetic procedure would be necessary to evaluate your condition and discuss options. Good luck.
You will need some augmentation of the jaw area just behind the chin. Also, you may need the chin revised. Was there a chin implant placed? You may want to start with an injectable filler to see how it looks after that. If you like it, then a permanent solution can be done. Best wishes.
The change in facial contour is notable. The 'reversal' of the change can be done with jawline implants and a genioplasty to augment the width. The augmentation can be controlled so that it is a natural positive change and does not 'go back to the beginning shape'