Low breast milk supply help!!

Does anyone else have this issue?? When my son was 5 days old I got mastitis, prior to getting it I was pumping about 9 oz (4-5 each side) every time I pumped. After I got it I am lucky to pump 3 oz total, I’m not sure if there is anything I can do about it or what I should do. I pump every 2-3 hours and over night I exclusively breast feed which seemed to help some, during the day about every other feed is from the breast and the other from a bottle to give me a bit of a break. I pumped earlier today and got 5 oz, 2 on the right (my slacker boob) and 3 on the left. There are only 4 oz since I used one for a bottle earlier. Two house after pumping 5 oz I barely pumped 1 oz between both breasts. I’m not sure what I can do, I’ve tried lactation cookies and foods that are supposed to help with milk production but nothing seems to work. I have already gone through all of my freezer milk, about 15 7 oz bags and 7 5 oz bags, since my son was born a month ago and I’m barely able to keep up with him. He has a dairy issue so I have completely cut dairy and when I was supplementing formula for his bili levels when he was born it was causing a lot of issues for him so I don’t really want to go back to that. Any advice, tips, or trick will help please.