Is there something I can say or do to scare my parent into quitting drinking?

Unless someone is intrinsically motivated to change their behavior, they won’t do it. The good news is, if you know what they care about most (hopefully you), keep showing them how their behavior is hurting you. If you find yourself in the position of taking care of them or “rescuing” them while they are drinking or after, stop. Allow them to experience the negative consequences themselves. At some point, you may decide that in order to take care of yourself, you need to live with another family member or friend. Sometimes when parents lose their kids, that’s when they realize they need help.