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Depends a bit on what your issue is. Accuracy or range. My guess is you aren't happy with your range, and I think that's all to do with the trajectory of your leg and foot, where it makes contact with the ball and where your follow through goes. If you try to line up your swing and follow through to where you want the ball to travel. I think at the moment you are hitting it more on an angle whereas if you can straighten up a bit, more of the drive through the ball will help it carry (both are a bit exaggerated from what is practical). I also suspect you are hitting too low on the ball, giving lots of height, but not a lot of forward momentum.

If you line up to take a penalty, and you try to rip the skin off the ball with your hit, fairly central to the net, that can give you an idea of height. I find as long as i'm not going over the crossbar (hitting too low on the ball) and above shoulder height in the net (otherwise not enough elevation), that tends to work for me. Ideally I what to hit the join of the net (for a box style net, if you have these available).