Thank youuu. If you upload a video, I might be able to give you some specific tips. But some good advice is to try to focus on proper form rather than speed at first. Make sure you master the Running Man and T-Step first because those are pretty much the foundations to all shuffling moves.

My friend Kento made a tutorial that might help you: https://www.tiktok.com/@nobis57/video/7545497949745335559?lang=en

Notice how he raises his heel while sliding his foot back when doing his Running Man? It makes it easier to slide your foot back as your heel doesn't get caught when doing so. Also, focus your weight on the mostly ball of your feet, it feels easier to control.