Hit the sweetspot.
I think all of us, with our flawed swings, could gain yardage and accuracy by consistently hitting the ball on the sweet spot of the club - irons, fairway woods, driver and putter.
Swinging for the fences is great, but I've seen too many guys with 110+ mph swing speeds being outdriven by guys with a controlled swing who consistently make good contact.
I clean my irons after every round, and without a doubt when I get to a club that has the impact mark(s) in the middle of the club, I can remember how great that shot(s) was.