Close/shut the door on something
Definition 1 of 2
Pro Tip 1/3Finality
Implies something is conclusively ended and unlikely to resume. 
He closed the door on his career as an actor.
Pro Tip 2/3Emotional Closure
Used metaphorically to express moving beyond past experiences. 
After years of grief, she finally shut the door on her loss.
Pro Tip 3/3Change of Focus
Indicates a shift in attention or interest away from something. 
The writer closed the door on writing fiction to focus on poetry.