I've broken my nose 3 times. And after the 3rd time about a yr ago my doctor said I need it fix. Can I still fix it a yr later?

Initially after an injury, the nose fracture can be repositioned.  Once the bones heal and are solid, rebreaking of the bones would be necessary.  This is typically done with a rhinoplasty.  Whether you waited a couple months or a year does not matter.  If there is breathing obstruction then a septoplasty may be needed as well.

Your nose can be fixed after trauma and its best to wait at least a year after it, so its perfect timing to look into possible solutions. One thing I would caution though that nasal surgery after multiple traumas is not an easy procedure. I would look for a board certified surgeon who has a lot of experience with noses before undergoing repair. Good luck