Exclusively pumping-supply is dropping!?

I was getting a total of 12-14 Oz every pump session about every 4 hours for the first 4 weeks. My baby is 7 weeks now and now I get typically 5oz. Yesterday I randomly got 8 with my wearable pump. So the last 3 days I’ve been using my Apple Watch to make sure I pump every 3-3 1/2 hours. Now I’m only getting 5oz. I don’t know if it’s because he randomly was sleeping 5-6 hours at a time for about a week and I didn’t wake to pump so I’ve been pumping more often. Yesterday, I even started doing the power pumping on both boobs and did extra on my slacker boob. My boobs never feel very full lately. My baby eats 6oz per feeding so I’m not making enough. I don’t know how else to increase my supply cause I pump for 30-40 minutes at a time. 30 on spectra and 40 on portable pump. I can’t alway power pump because I’ve begun working again. I’m drinking a TON of water too. So what do I do? Or will my supply increase with time???