Both the size and shape of your nose are genetically determined. Most doctors and researchers agree that there are no medically approved procedures or exercises to change the shape of the nose, aside from surgery.
Plastic surgery might be needed if you want to elevate the bridge of your nose. However, before you make your final decision you might want to consult with a plastic surgeon about the possible complications from the surgery.
Immediately after the surgery you might have problems with breathing through your nose because the nasal tissue would probably be swollen. If the problems with breathing continue after several weeks that might mean that the air flow is disrupted and revision of the nasal cavity might be needed.