Will Exercises to Flatten out a Cartilage Graft in my Bridge Work?

It sounds like you may have had a radix graft during your surgery. It's hard to make a full assessment without seeing you in person, but I do feel that it's a bit earlier to consider revision surgery. Nasal exercises won't hurt matters in the meantime.

I have personally found it possible to perform minor tweaks to radix grafts using a small hypodermic needle in the office. It has allowed me to shave off a slightly prominent cartilage edge without a formal surgery.

If the edges of the the cartilage graft are indeed the problem, as you describe, then massage will not correct your problem.  Sometime in the future you will most likely need a revision with removal of the graft.  You stated you had a dorsal hump removed, so I am not quite certain why a dorsal onlay graft was placed.  If further dorsal augmentation is needed I would suggest diced cartilage fascia grafts.  These grafts are moldable up to three weeks postop and will not have such visible edges as standard cartilage grafts. ....Good Luck....Dr. Corrado