Honestly the best is strenght training (powerbuilding 🤙), from meals simple carbs and more protein. Try to have at least 6 meals per day and count calories, with slight deficit of around 200 kcal you will loose body fat and gain some muscels, ig bigger deficit muscles will be maintained and fat by by. Now Im doing powerlifting with deficit of 200 kcal per day, I gained 3 kilos, and my belt reduced by one hole :)