1. Hit the shot as if you didn’t care. I mean just take your swing, without any idea of where the ball is supposed to go, or what trouble might be lurking if you make a mistake. Make a carefree stroke at the ball is about the best I can describe it. The calmness that approach creates allows your body to flow into the swing without tension causing deflections from its proper course. This applies to putting, too.
2. Hit short shots with an easy, flowing swing. Putting tension in the swing, jabbing at the ball, trying to hit it sharply, all these things are what cause mishits. So does not paying attention to item 1, above.
3. When chipping onto the green, focus on the landing spot. Pick the club that will release from there to the pin, but your target is the landing spot, not the pin.
4. There is nowhere that the idea of having your hands lead the clubhead into the ball will pay off more than with your driver. It seems you are taking all the power away when you do this, but what you are taking away is the powerful feeling of the right hand hitting, which is actually a power drain, and which pushes the clubface out of alignment.
5. Do you use the alignment mark on your ball when you putt? If you line it up with your starting line (and don’t take all day to do that), you will sink more makable putts than you have been, and miss far fewer of those shorties.