Using cartilage grafts over nasal dorsum to increase dorsal height and improve the profile is a commonly performed procedure. The sources of cartilage may be nasal septum (unless your septum was already operated), ear cartilage, or rib cartilage. The main problem with cartilaginous dorsal inlay grafts is malpractice/ asymmetry. There are various techniques to minimize this risk, such as wrapping the cartilage in soft tissue, mincing the cartilage, or suturing the cartilage, however none of these techniques are perfect. There is a role for filler injection to correct the dorsum, which has its pluses and minuses. You should consult a rhinoplasty specialist to discuss your options.