Increasing milk supply???

It’s been almost a month since I’ve had my baby and we’re STILL supplementing formula. And now she is happier with the bottle because it comes out faster. I’d be fine with that if it was my actual milk she was drinking. I pump as much as I can which is like 3 times a day. Each time I can only get half an oz- 1 oz from both breasts. I just want to get rid of this formula!!!!