What is the best way to get range of motion back after a broken bone?

I broke my right humerus playing hockey (cross check to the arm) about a years ago. The break required surgery. I did basic physical therapy afterwards but am still having issues with range of motion and am unable to extend my arm fully. Everyone I speak with has a different option and exercises (including light weight and stretching) to do and I am curious if these exercises will help regain range of motion, or are they more focused on not losing more? Is there a best practice for getting your entire range of motion back after a break?