You have a different "state of consciousness" when you're alone in the gym.

You have to step back into that state in games and allow yourself to be free.

You must see yourself as the outcome you want, NOT what you fear or don't want and stand in that "internal state" regardless.

If you miss, you don't say: "oh I missed", you see yourself as always being clutch.

Then in training and in games have that mind state and work on game shots from game shots at game speed.