here are a few suggestions;
1- leave your driver at home and use a 3 wood on the tee
2- practice long putts. make your goal to try to 2 putt every green. Most amateur golfers usually come up short when they do manage to hit the green and end up with a long first putt. if you can 2 putt every green instead of 3 putting you'll shave 18 strokes off your game right away.
3- practice chipping. Like coming up short on the green, coming up short on your approach shot is very common for amateurs. You can save a lot of strokes if you can chip well. Along with chipping practice, try using your 8 iron for chip shots. You may find it's easier to accomplish a better chip shot with an 8 iron than a wedge.