What can I do about my narrow/small jaw? (Photo)

I’m wondering if there’s anything I can do about my narrow/small jaw. My teeth are straight and my dentist says there’s no problems. I booked an apt with an orthodontist as well to make sure nothings wrong/underdeveloped. I was reasearching about my issue and it’s possible I might have “mouth breather face”. I’m not sure if I should see a plastic surgeon for a jaw implant or seek a maxillofacial doctor. I also have chronic TMJ and allergies.