After a quick view, the things I see that are an issue are:
Hand positioning on the side of the ball. The shoulder, the thumb, the bridge between the fingers, and the center of the ball should all be on the same vertical plane.
The short push forward / hinge causes a short backswing. Cant tell if the back swing is limited by the closed shoulders, or that just how low the natural pendulum swing was going to stop.
The forward swing appears to be kind of forced. Evidence the turning to the right of your body during the slide, and made clear by the slide foot ending up pointed far right.
Finally because the hand position is on the outside of ball, your release position is very low in leverage. Again, the shoulder, thumb, bridge, and center of the ball should be in the same vertical plane just before the thumb exits the ball.
With your hand on the side, if your thumb comes out a little early, your fingers are going to push the ball to the left of target.
As for the feet being fast. You have to travel distance from where you start, to where you stop in the time it takes for the ball to swing back, and swing forward to the bottom.
The short push away, and back swing, makes the time to cover the distance small, so the feet have to travel fast.
I'd say work on hand position first,
Then possibly increase push away to increase backswing.
Open the shoulders if you feel the backswing is being restricted by the shoulder.
Finally try to slide with the foot pointing towards the target, not pointing towards the right wall.
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