So based on what info IS provided, your Descendants x Creepypasta fic definitely sounds interesting. However, a couple of things:
Try getting a more hooking cover. Wattpad offers Canva, and it has an AI feature that can make a cover for you as long as you give it a prompt for the drawing you want. Second, maybe for the blurb (aka, description above the chapters), try giving the reader a glimpse at the plot that will leave them wanting more. Other than that, just keep improving at your narration skills, and you'll be great!