Worrying About My Milk Supply 😔

I Think My Milk Supply Has Decreased! Around week 1&some of week 2 I could get almost 3-4 oz from each boob but not anymore. I have been drinking mother's milk tea for a few days and day 1 when I pumped I got 4oz from one boob and like 3oz from the other. Now I can only get 2oz from one boob and 1 oz from the other. I eat oatmeal everyday and I drink plenty of water but I'm also pumping after each feeding which before I pumped when I was supposed to feed. My daughter only  drinks 2oz of breastmilk when fed with a bottle and she is full. Do you ladies have any suggestions or tips to help increase my supply? I'm thinking my Supply is regulated on how much she feeds.