I've found a number of techniques to make my patterns better, although you might already know them. We all know how important technique is so I wont go into that, but on the more subtle points, i feel that the yell is so important. I build mine up, controlled 'grunt' early on, and at the end the most fearsome yell i can muster. It really ads to the feeling in your routine.
Confidence is of course a nother real winner.
I think it helps to imagine an opponent infront of you for each of the attacks in the pattern. Or to imagine your not in the hall with all the judges and spectators, but alone in the woods somewhere.