Exclusive Pumping

Hi mommies. Any exclusive pumpers here? Hope you have tips to share. My baby and I are having a difficult time latching so I had to introduce formula. I haven't stopped pumping though as I still want to offer my breast milk. Baby is currently 15 days old. I am struggling with my supply. I pump 8 times a day but only yield a total of around 12 oz in 24 hours. Gusto ko sana mag exclusive pumping but di pa kaya. :( mixed feeding kami now.