Nursing mommas, what did u do to help increase your milk supply?

I have a low milk supply, especially in my right breast. I almost always have to give my son a bottle after every feeding bc he is still hungry and I able completely drained. ( I normally offer a bottle after half of his feedings doc recommended since he hasn't been gaining enough weight. Normally he only takes .5-1 oz but lately he's been taking 2+ oz) I pump every day. Normally only once for 40 minutes on each side. I'm trying to do twice a day. But I'm still figuring out a routine with a newborn. More on the right then left. My son has a hard time latching correctly on the right side. He pushes himself away. So I feed him more on the left and make sure to pump more on the right. When I first began pumping I would get nearly 4 oz in about 40 minutes. Over this past week I get maybe 2 oz. My breasts never feel full.

I was just wondering if anyone has taken anything (ive seen things about BodyArmor drink). I'm not sure what's worth to try. If anything has worked for you. Just looking for recommendations and help. Thanks :)