Breastfeeding at home, pumping at work help!

I am currently just shy of 5 months postpartum. My son is breastfed when I am with him otherwise he is eating 3-4 5oz bottles in a 12 hour period. I pump 3 times a day at work now and can’t seem to get more than 6 ounces at work. I am also pumping at home once in the morning and once at night now (I wasn’t before) to increase my supply. I don’t want to do anything that could decrease my supply but I need some ideas as to how to help increase what I am getting throughout the day. I also have high Lipase and need to scale my milk before freezing if that has anything to do with any solutions. Thanks a ton!