this is an unethical method and dont really encourage anyone to do it unless your schedule is ****ed, but, pull an all nighter on a day off, and dont let yourself fall asleep until a decent time. Set your new bedtime and stick to it, and wake up at around similar times, your body clock will naturally shift once you form a habit
just realised this post is 5 months old lmao well advice for anyone in the same position ig