Raise Your Feet
If the swell in your ankles results from fluid retention, elevating your feet can help drain the fluids. When seated, place your feet on a pouf and when sleeping, place a pillow under your feet. If you are working on your desk and have no way to elevate your feet, take regular breaks, and walk around. With your ankles parallel to the ground, twist your feet a bit so the ankles rotate gently. This is another way to drain the fluids.
Exercise More
Exercise is recommended whether you have swollen ankles or not. However, when you have swollen ankles, exercise increases blood circulation and reduces the chances of fluid retention in the feet. Exercise will help your heart function better, increase your metabolism, and generally improve the functioning of all body organs. You do not need to engage in strenuous workouts as long as you walk, jog, or run. You can also take swimming if you need a low-impact workout to save your knees and ankles.