What can I do to improve my side profile and achieve more definition in the face? (photos)

Thank you for your pictures. Your facial features are out of proportion. I recommend you rhinoplasty along with a chin implant. During rhinoplasty surgery, the base of your nose can be narrowed, nostrils and wings can be smaller, projection can be reduced and some cartilage can be removed from the tip to give it more definition while maintaining its masculinity. A chin implant is necessary to help enhance your small and receding chin and add definition and contour to the jawline, profile, and lower part of your face. These surgeries will improve your facial harmony by bringing balance to your nose and chin.
Best wishes.

Thank you for your question and sharing your photographs.
As a non-specialist in this field, my impression is that the problem is generated by a slight mismatch of the upper and lower jaw that could be treated by orthognathic surgery.
If you are contemplating an intervention also on the nose at the same time, Prof Mirco Raffaini in Italy has experience with combined jaw surgery and no surgery.
Otherwise the sequence of treatment tends to be the jaw surgery first and if needed to consider nose surgery, in particular if the shape of the nose has changed significantly after the jaw surgery