Rhinoplasty candidate to narrow the bridge and tip
The rhinoplasty procedure would involve narrowing the nasal bones with osteotomies, narrowing the nasal tip, and an alar plasty to narrow the wide nostrils. This is a full rhinoplasty, not a tip-rhinoplasty.
African American Rhinoplasty.
You can have just the lower third made smaller as long as u realize the upper 2/3 will look wider, and can be addressed later. See a very experienced rhinoplasty surgeon who is very familiar with AA rhinoplasty.
Congrats on your interest in improving your nasal appearance. You would benefit from a full rhinoplasty including tip work and nasal ala reductions. Cost varies between surgeons. Most of us offer financing options. I would recommend meeting with a few surgeons to get a feel for price range as well as appearance expectations.