Help slacker boob

Is there anything I can do to help my slacker boob. I usually only pump once a day and it's usually at night. I wait 2 hours after my LO goes down for the night before I pump. Normally I get about the same amount from both sides sometimes the left one (the slacker) will produce less. Tonight my right one I got almost 4 oz and on my left I got a lil over 1 oz. I know my LO can drink more out of the left compared to what the pump gets just trying to see if theres anything I can do to help that one produce just a lil more.