Breastfeeding mommas I need help!

Rebekah • Baby noble due in March 🍀💕

My baby is 3 weeks old and I can barley pump an ounce in the morning then it kinda dwindles down to 15-20 ML towards the night and idk what I can do to boost milk supply I’ve been drinking a lactation milkshake in the mornings I just can’t pump anymore and my daughter won’t latch for long periods of time she gets very fussy so I mainly pump is there any tips or anything I can do ?