I started off breastfeeding the first 3 days my baby girl was born until my nipples got too sore and…

I started off breastfeeding the first 3 days my baby girl was born until my nipples got too sore and I couldn't handle the pain so I started supplementing with enfamil. Now I'm trying to go back to only breastfeeding so I've been trying to increase my milk supply back up. Any suggestions on how I could do that? I've been pumping as well but not getting very much out.