Increasing milk supply

Kim • Pregnant with #1 after about a year of trying. Due end of October and very excited!
What are some good ways to increase my supply? My LO was 5 weeks early so while I am giving her exclusively breastmilk, I'm pumping and bottle feeding to be able to measure how much she's really getting. I was consistently pumping 8 times a day when Baby was in the nicu. But now that we are home, its harder to get 8 pumps in per day and I'm seeing a decline in my supply. I'm eating oatmeal, drinking tons of water, and pumping at least 5 times a day. What else can I do to help my supply?