Avoiding irritants, decongestants, and adding humidification can help with allergic problems. Allergies can be seasonal. Partial mechanical obstruction means it takes less swelling before your nose closes off. People with enough chronic irritation even develop overgrowths of the mucosal lining of the nose called polyps. Such overgrowths can also obstruct the nose.
Medical treatment can help some allergic problems.
Check out what is on the web about allergic rhinitis and the medical treatment of nasal obstruction. Your option for cosmetic concerns is not to have any surgery. Cosmetic surgery is elective, surgery that you do not absolutely need. Cosmetic concerns, deformities and appearance are REAL problems. They are often trivialized unnecessarily, making individuals unhappy.