Your question is Handling Rejection Without Feedback. 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).
Tell me about a time you were rejected after a long, high-effort process and got little or no feedback. How did you respond in the moment, what did you do to learn from it anyway, and how did you decide what to change next?