Try working on Vertical leap, and try working on short sprints as well, as you might be able to better train the Fast Twitch Muscle Fibres that way, which you need for things like accelleration across the court, and Vertical leaps.
Even basic leap stuff, like focusing on a point of a wall, and trying to see if you can get your Finger tips ot touch it. Satrt low, work up. Tatty walls might be best, as you might find focus points, like a small crack, or a weed, or a bit of moss.
Could be things to consider.