Do your exercises longer-Basically - If you're not losing weight anymore by walking for 30 minutes... Then you need to start walking for 45 minutes to 1 hr. Workout twice a day-If you have time then you can workout twice a day to increase your metabolism by working out in the morning on an empty stomach to burn more fat and then working out again in the evening or after dinner.Make sure you're eating right to lose weight.Your body needs less & less calories to maintain your new weight after losing weight so that maintain your portion control.