@Naira447 I would guess someone reported your book to wattpad and that is the reason why they deleted it.
I don't know much about inkitt but I think you should try to write there. From what I've seen, your book will probably be deleted again if you re-upload it here. It's never happened to me personally because I don't write books but when I read books and they get deleted and the author tries again to upload, then they are usually deleted again by wattpad. but not always, have seen them get re-upload and the book remain up. So you can try again here. But also test inkitt.