Your question is Prioritize Testing Under Severe Constraints. 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 are responsible for QA on a high-impact software release and discover that the available test time and people are far below what the original plan assumed. You cannot fully test every workflow, environment, and edge case before the release decision is due, so you need a clear way to decide what gets covered, what is deferred, and what level of risk is acceptable.
How do you prioritize what to test when time or resources are severely constrained?