I think honestly the biggest improvement I've made since I started shooting USPSA was losing my hesitancy to move my damn feet. I used to walk very slowly and deliberately, or sort of shuffle places while trying to half-heartedly shoot on the move. I've now realized it's much better to sprint from position to position, to shoot and move on. I still manage to shoot on the move but I reserve that for high-probability targets that are between me and a good position to shoot a lower probability one.