Sinuses can be repaired but not replaced. A sinus specialist can perform a CAT scan and show you what is going on inside your nose. Don't scuba dive with poorly functioning sinuses or if you can't clear your ears. You may be able to restore normal sinus function with surgery.
Hello - yes probably your sinuses can be improved. It is likely not much or any damage was done to most of your sinuses which are much deeper in the maxillofacial skeleton. Your first step is to see and otolaryngologist who specializes in sinus problems. A sinus CT will need to be done to map your nose and sinuses. A treatment plan can be proposed from here. In the meantime it would probably help for you to do daily nasal irrigation with an irrigation kit (like the Neil Med kit). Good luck!
I recommend you see an otolaryngologist (ENT doctor) for evaluation of your sinuses. They can be repaired to restore normal function.