If you have ever watched absolute amateur players who come to the courts about once a year, they invaribally want to hit the ball as hard as they can (which they do), and they spend most of their time hunting balls that sail over the fence.
Obviously, they will never enjoy the feeling of becoming an acomplished player, because they have no patience for learning control and form.
Now, even though you are much better than that-- control, good form and consistancy should still be your main goals- not flashy, risky shots.
In fact, those things, controlling the ball with spin and placement, good movement/footwork/strokes, and the ability to keep the ball in play can win you many a match.
PRACTICE, drilling and the confidence they build are the main secret weapons of tennis. Practice placing your serve, returning serve cosistantly, placing your shots to a specific location for a specific purpous.
As you strive for consistancy and form, you will notice that your entire game improves, becomes crisper, stronger, efficient.
With practice, eventually, almost without realizing it, you will develop a powerful forehand, backhand, serve or volley.
Good luck,
B
Practice your strengths as well as your weaknesses. Your goal should be to hit any shot of any kind from any player, and hit is with confidence.