Increasing supply?

My little one is 3 months old and is eating between 3 - 4 oz every 2 - 3 hours. I am breastfeeding when I am home andI pump when I am at work. I generally can only pump between 7 - 10 oz while I am at work. If my boyfriend feeds her 4oz every 2hrs... I obviously can’t keep up the supply. I also need to have surgery in about a week and a half, which means I have to pump and dump, but I maybe have two days worth frozen currently. I’d rather not supplement if I can help it. I need all the tips I can get! I’ll try anything at this point. Help!