Baby is 2.5 months old There was a lot of milk at the beginning, I pum…

Baby is 2.5 months old There was a lot of milk at the beginning, I pumped several times a day Now there's very little milk, almost none, I have to supplement the baby with formula. I really want to continue breastfeeding I drink teas and formulas for increased lactation, but the problem is that after each feeding, the baby starts gagging. What would you recommend to increase lactation and continue breastfeeding? Thank you so much for your answer!