How Can Nasal Deviation Caused By Trauma Be Corrected?

My nose was broken in auto accident when I was 18. I didn t know it had been broken until much time after the accident due to swelling and other injuries. There s no lumps in it but it definitely veers to the left looking straight on. What would need to be done to correct this an invasive surgery or a breaking of the bones??? I m 34yrs old now, so it s been like this for awhile.