If you plan to lose fat by yourself, in fact, you only need to consume calories as scientifically as possible within your personal ability, and then pay attention to the control of calorie intake and rest and recovery.
If you drop from 57 to 48, the scientific training method is 4 months, 3 months of hard work, 2 months of madness, and hell 1 month. Unless there are special needs, the latter two are not recommended.