Pumping help

So this is all I can manage to get out while pumping. The most I’ve ever gotten is 2 oz per side. I try to pump 2-3 times at work but I still can’t seem to get over 6 ounces per day 😔 Any tips on upping supply?

I feel like I’m starving my little girl. I know pumping isn’t accurate of supply, but she needs more for while I’m gone. I’m nervous I’ll have to start using formula if I can’t get my supply better while I’m at work.