As you get better in squash it becomes more difficult to go short because your opponents read the game better, are faster, hit it harder and tighter and the ball is usually warmer. This is why I spent a lot of time solo hitting working on my drops on the bounce and on the volley. I often practiced with a blue or red dot so the ball stays bouncy and even bouncier than it would be in competition. Here's the video clip of me playing some drops on the bounce. I'll post another one soon of me working on my volley drops and nicks. Enjoy!
I still make a few errors and my short game could still improve, but it has gotten stronger over the years. I remember about 15 years ago watching some top PSA players play and I noticed how much they cut their drop shots. The ball was so bouncy it was the only way they could get the ball to stay somewhat short on the court. I see many amateurs waste excellent opportunities because they have not spent the time grooving their short game swings. Don't be one of those players. Work on your short game all of the time and it will pay major dividends over the months and years.
On a closing note. I will be travelling to Europe in June (Belgium, France, Spain and maybe others). If your squash club is interested in setting up a clinic or an exhibition please contact me at email@example.com.