Is it possible to reduce the height of my chin after a genioplasty? (photos)

From the photos you provided, the length of your chin appears proportionate and aesthetically pleasing to me. However, I understand your concern about the long shape that might be visible from the front view. It is important to note that from the profile view as well as from the front view, the high jaw angle can create the sensation of a longer chin.
A potential solution to minimize the perceived long chin look is through the use of custom-designed jaw angle implants. By lowering the angle (radius) of your ramus, the perceived length of your chin can be significantly reduced. This procedure can create a more balanced and masculine appearance, which is often associated with attractiveness and good health.
A comprehensive evaluation and open communication with your surgeon will help you achieve the aesthetic goals you desire.
Best regards,

You have a vertical facial growth pattern with a steep slope to the lower jaw and a narrow lower jaw. The answer is to augment the jawline behind the chin and increase the 'ramal' height. This will alter the 'long face' appearance and define a good jawline