Actually, I'll get you started. You look on the younger side so I am keeping that in mind in how I guide you.
It is good that you are leading with the butt, but I think overall you need to get everything more neutral and natural more like walking. You've got some funk in the legs and footwork that is blocking you from moving smooth and natural like Simon.
Stand up/walk forward naturally. Do your toes point straight forward, more out to the walls, or more in toward each other? You actually want your feet to naturally walk/run/hop that way in an X-step - just more "sideways"!
1. You look like you're kind of focused on "squeezing in the knees" in the beginning. Don't do that - just a natural walk!
2. In the X-step, get your rear foot more pointed toward the camera rather than directly away from the target. You should be coming more "sideways" off of it than you are there.
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Walking down the stairs with this drill can be helpful:
Watch Simon walking more "sideways:"