How can I increase my breast milk?

I’m only pumping 1 oz from both breast’s combined every two hours and I’m almost 3 weeks pp. I’m meeting with a lactation consultant this week, but am wondering what has worked for everyone here to increase breast milk.

Background from my delivery that may affect my breast milk production. I had a pp hemorrhage and wasn’t able to hold baby right away. The doctor had to scrape my placenta out and stopped the bleeding, thank god. I’m wondering if I still have placenta leftover in me. In addition, I have really low iron levels due to the hemorrhaging. My milk did come in about 2 weeks pp, so I’m hoping within the next couple days my milk production will increase, but who knows. Anyone else have experience with this?