i want to lose weight but do things and completely regret it

i’m an alcoholic, the drink i like drinking a lot is a ready to go pineapple coconut beverage, chat gpt told me a 275 ml bottle (20% alcohol) contains around 500 calories so that is a lot of my calories gone, recently i went from 90 kilos to 78 kilos but due to a very low protein diet i do still look fat due to a lack of muscle, how can i discipline myself, (food, alcohol) etc i need to fix my body, whats a trick you guys used?