Pumping half oz

I use to regularly pump to empty myself earlier on but stopped because my baby refuses bottles, only eats off of me so the stash was getting too full. Now we are 6 months & I’ve been feeling like my baby isn’t getting enough because he’s constantly on my boob & I never feel full anymore I never leak anymore I also can’t remember the last time I felt a let down, never seems like he’s actually chugging while nursing I feel like he’s just nawing his gums, & his weight is different every single time we weigh so I just don’t know. His diapers tho are starting to seem bigger when they did start to seem smaller,

Well today I tried pumping again to increase & just seeing the amount that comes out from both breast is discouraging. I am also expecting so I’m worried my milk is drying up as well, I’m not sure if this is a normal amount to pump for a nursing only mom? I am going to start having pumping sessions now to try to increase I just don’t know how to go about it,

1) pump after feedings for extra time?

2) have set times through out the day to pump each boob?

3) power pump * I’ve tried last baby & it didn’t work*

Side note. I noticed a tooth cut through finally today so I’m wondering if teething is just the cause of all this? My other babies I only got to nurse for 4-5ish months was