Your question is Prevent Unseen Data Performance Degradation. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You have a model that performs well offline, but the real concern is whether it will hold up on future operational data. Describe how you would evaluate it before launch and monitor it after deployment so degradation on unseen data is detected early and handled safely.