An easy way to teach any student is called "Brush-Pull-Snap." On a majority of ground strokes, brush up on the ball. This will open up the door to learn a semi-western forehand and the open stance (to shorten the backswing) and topspin.
On the majority of volleys, pull through the ball. Instead of practicing a volley that starts near your body, where you are strong and then hitting the ball away from you, where you are weak, try this... Hit the volley by starting the racket away from you, where you are weak, and actually hitting it by pulling the racket toward your body, where you are strong and ready for the next shot. You can also try this "pulling" technique on short bouncing balls and some approach shots.
On your serves and overheads, learn to "snap" your wrists. Many players "push" or arm their serves and overheads. Snapping deals directly with your wrist. Use your arm and shoulder for height, use your "wrist snap" for power. Try these ideas, you will find it easy to remember and it may modernize your game and make the game more fun.
Good luck on the courts!