Breastfeeding help! 🧐😭

Any tips on how to increase my milk supply? I eat oatmeal and protein bars and whole milk Greek yogurt. I nurse my infant (4 weeks old) all day and don’t have any extra to pump and freeze for when my mom watches her. When I pump I can pump 5 oz in one session, but then my breasts feel empty for the rest of the day and my infant wants to nurse 10x more because I feel like they aren’t refilling fast enough... stuck!!!