Does undergoing surgery to correct the nasal cartilage to improve the senses of smell and taste constitute an alteration of Allah's creation, especially given the unknown reason for the cartilage deviation, and what is the ruling if these two senses later improve without surgery?

There is no objection—Allah willing—to performing the aforementioned surgery if there is a noticeable defect in the sense of smell, regardless of whether the cartilage was originally deviated from creation or not. This is because the purpose of the surgery is to remedy a defect and remove harm, not to add beauty. Thus, it is not considered an alteration of Allah's creation.