Milk production

Hey guys. I’m looking for some advice. I noticed since I went back to work, maybe even slightly before then, my milk production dropped DRASTICALLY. I went from pumping about 4oz each breast per pumping session to being lucky if I can pump one oz between both breasts per session. I’ve tried almost everything. Pumping more often, lactation cookies/ drinks, making sure baby is latching right, more frequent feedings, you name it and I’ve probably tried it. Is there anything you moms have done to increase your milk supply? If so please send some info my way! Thanks!!