I always go back to basics. My game sometimes mutates over the course of a few months (maybe my speed creeps up, or hand, etc). Think back to whatever it is that makes your game - or the one or two things you have to do well to make a good shot. Then hit the practice lanes.
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I slept with faith and found a corpse in my arms on awakening I drank and danced all night with doubt and found her a virgin in the morning.