Low BreastMilk Supply 🍼🆘

Nursing mommies, i need some tips! My Twins are 3 months old now and I’ve always nursed them since day 1 while supplementing with formula since about 3 weeks old or so. I started supplementing because my boobs were super sore to where they were bleeding and blistering. I’ve always pumped to empty. Since I’ve started supplementing my supply has decreased (not that it was ever more than 2oz at at time before supplementing). Now I’m lucky if I get 1oz from both sides. What are some ways I can increase my supply? I’ve tried oils to massage on my breast, I’ve tried drinks, teas, and even nursing before giving my babies a bottle every 3 hours. Nothing seems to be helping... any tips?!? 🆘🆘