Where I grew up, there was this older kid who perfected a shot that I had never seen before - a kneeling overhead! He was able to hit it from anywhere on the court, and it usually ended up as a winner. The shot really amazed me, so I had to learn it and use it whenever possible.
With the right positioning and timing, you can get some good speed on the ball, and you'll likely have the element of surprise on your side. Here's how you can practice it close to the net:
Right-handed:
Left-handed:
Give it shot and let me know how it's working for you!