I broke my 4th metatarsal 5 years ago, but never got it fixed. What are my treatment options?

Treatment options. Include doing nothing. Does it hurt? Sometimes the bone heals correctly on its own. If you have pain you can see the foot doctor and they can take x-rays. At this point in time if you need it corrected the only way is likely surgical correction.
Maybe nothing. The only reason to do anything now is if it is causing you difficulty. If it is the only option other than living with it is to have surgery to re-break the bone and set it properly.