Supply issues

Ash

I recently went back to work so I’m pumping a lot now. While I was on leave I was nursing and I always seemed to have plenty of milk for her. Now that I’m pumping, I’m struggling to keep up with what she’s eating and my supply seems to be decreasing. How do you maintain a good supply when pumping? I pump every 3 hours when I’m at work and nurse when I’m home with my baby.