Milk production

I’m 13 days PP with my first and have been supplementing with formula in addition to a few breastfeeding sessions every day along with pumping. I pump about an oz or 2 if I’m lucky per session, which is 30 min each time. I am eating a ton of oats, oat milk, lactation cookies and brownies. I’m feeling extremely disappointed in how much I’m able to get out of my pump sessions. It’s so discouraging to see such a tiny amount for 30 min. I’m trying to be positive but I just feel annoyed with my body bc I’m sooo ready to get my daughter off formula and exclusively to breast milk. Any ideas or tips on how to increase it? More breastfeeding sessions? More pumping? Please help!