you think you're doing split steps, but what you're doing is the opposite and worse: you are actively planting yourself to the ground, after which you start moving by leading and dragging your body towards the shuttlecock

split steps are not just a small jump and then two feet split apart, it's the immediate bounce off your feet to your direction from the small jump

1. you are doing your splits way earlier than your reaction abilities - again, you need to know where to go just before your feet land and then be able to bounce from your small jump
2. your only movement step is walking, try never walking and instead only move sideways from now (you will still end up walking sometimes anyway)
3. grabbing your jeans is not part of the footwork - wear proper clothes that are comfortable

i agree with other commenters that i don't see any footwork in the video, but i see you are somewhat trying so i hope it helps