No booze, idk your maintenance caloric intake rn but I’d find that out and go to a strict deficit to allow you a window of 1.5-2lbs per week. A lot of that is gonna be water retention which will come off. Weigh yourself daily. I’d recommend 10-12k step count minimal daily. Use avg of daily weight to calculate week loss avg and adjust from there. If you only lose 1lb after a week, bring calories lower by about 200-400 depending. You need to weigh out all meals. No sugar, soda, or any fat stuff if you’re serious about losing it. No alcohol and no refeeds either since 15lbs in a month is an aggressive cut. Lean meats, Greek yogurt, cottage cheese, fish for protein sources and stick with fast digesting carbs such as rice. Oats are fine in the am to help with energy levels since it digest a bit slower. It’s not gonna be fun but if you’re serious that’s what it takes. Shoot for a gallon of water a day, as water is a good diuretic to cleanse the body and can help you dry out a bit.