This seems obvious to me. The way to take less third strikes is to swing at them. While he will still miss some, a percentage of those pitches will turn into balls in play. Even if that number is super-small at say 20%, with as many times as he has taken a third strike, that is a significant bump up for his hitting numbers (BA/OBP/SLG etc) which is he currently getting zeros for, and it also takes a big chunk out of his K%. The kid could literally push to an .800 OPS player by swinging at more pitches close to the strike zone, and nothing else.