Increasing Supply

Hi all - looking for tips or ideas from experienced exclusive pumpers on how to increase my supply more quickly. I’m 3 weeks pp, exclusively pumping every 3 hours, and just started power pumping once a day 4 days ago at my IBCLC’s recommendation. The IBCLC also suggested moringa root so I ordered Legendairy Milk’s Cash Cow supplement but haven’t received or started it yet. I’m averaging 1.9 oz per session but not seeing an increase day over day - feels like I’ve stagnated at this amount. Appreciate your insights!