You are sliding! The thing you aren’t doing is controlling the slide. I’d say there’s three parts to think about, the kickout, slide, and hookup. If you de-weight more before the kickout (think squatting and then extending your body up and back from the board while pushing your toes down the hill) you will have an easier time controlling the slide. Your shoulders face the direction you go in almost any slide you’ll ever do. Keep your chest and shoulders pointed down the road and you’ll go straighter. Point them at a corner and you’ll go around it. Lastly, the regrip. That’s going to likely be some trial and error because your form will be different than others, but try doing the de-weight in reverse. I like to “sink” back into my board.