Pumping tips

Anyone have tips on producing more milk when exclusively pumping? My baby is 2 weeks old and I’ve managed to pump enough to exclusively feed him my breast milk but lately he has been drinking WAY more up to 3-5 oz per feeding about every 3 hours. I had a little supply in the fridge when he was eating less but now he’s caught up and I have no stash and I’m not pumping enough milk to keep up with him!

I have a double electric pump that I use for 20 minutes every 3-4 hours in the day except lately at night I’ve had a few times where I slept 5-6 hours while hubby cared for baby. I eat oatmeal, drink lots, I’ve tried power pumping a few times but my supply is about the same. I get about 1-1.5 oz from one breast and 2-3 oz from the other.

Any tips on how I can increase supply naturally?