I have very difficulty to produce breast milk. I produce only 4 oz a day. Almost give up, can anyone give me advice on how to increase quantity?

There are many ways to increase your supply. 1. Frequent latching 2. Power pump. To pump more often. Pump every 2-3 hrs. 3. Eat milk boosting food like oat, salmon, yogurt, green papaya fish soup 4. Relax. Stress can lead to low supply so it's important for mommy to stay happy and relax too. 5. Drink more water