It is likely you will need both a septoplasty and rhinoplasty. The septoplasty will improve your breathing, but the rhinoplasty will improve the appearance and straigthen your nose. See a board certified facial plastic surgeon who specializes in rhinplasty for an opinion.
Based on your photos, a revision rhinoplasty would be needed to help straighten your nose. It appears that your silicone implant has shifted and this would likely require removal. A septoplasty would only address your nasal septum and when performed alone, would not change the external appearance of your nose. I would recommend seeking out a consultation with an experienced, board-certified revision rhinoplasty surgeon. Good luck!
A revision rhinoplasty is required to straighten a crooked nose. A septoplasty is performed to improve airflow dynamics through the nose when there is air flow restriction in the back of the nose. A septoplasty will not change the shape of the nose. Osteotomies placed in the nasal bones are required to straighten the crooked ridge line. If a silicone implant is in place and is crooked, it can be removed or replaced. For many before and after examples of crooked nose repair in our practice, please see the link and the video below