Eating a "healthy" diet rich in fruits, vegetables, whole grains and low-fat dairy products, also called DASH (Dietary Approaches to Stop Hypertension) diet, can reduce your blood pressure by 5 mm Hg.
Potassium helps your cells balance out their sodium content/intake. If you don't consume enough potassium, your cells may hold on to too much sodium which can lead to higher blood pressure. If you have high blood pressure, try eating more foods that are high in potassium like bananas, potatoes, yogurt, orange juice, lentils, pistachios, etc.
Vitamin D can affect enzymes produced by your kidneys that affects high blood pressure, so taking a vitamin D supplement can help lower your blood pressure.