What should I do after jaw shaving surgery?

I got jaw shaving surgery about 3 months ago because my face was too long and narrow and I wanted more of a point at the chin. The front part is fine but when the doctor shaved the jaw he took away the good projection in the chin I had from my side profile that really gave my face structure and supported the neckline and jawline. Now my neck and face and jowles are all saggy and I'm 22 years old! Should I get a sliding genioplasty or fat transfer to get the projection back from the sides?

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