Insufficient breast milk

Has anyone had issues with insufficient breast milk? I’m 7 weeks post partum, waiting for my bloodwork to return to see if any levels are off (levels were good before delivery)

I’ve seen a lactation consultant a few times, am trying to get more sleep, am trying to pump more often, etc but I am producing only 1/3 - 1/2 of what my baby needs and am supplementing with formula.

I’m wondering now if it could be my thyroid affecting production. Curious to know if others encountered this issue and if anything else worked!