Aside from keeping full and hydrated, you might wanna try cluster feeding/pumping:
20 minutes breastfeed/pump,
10 minutes rest,
10 minutes breastfeed/pump,
10 minutes rest,
10 minutes breastfeed/pump
Do it everyday, same hour on consecutive days.
Its important to always stimulate and empty your breasts so that they get milk again and again. Be patient. Goodluck! :)
Magbasa pa