Breastfeeding help please!

Bailey • Mommy of 1 little boy ❤🤱

I have a slacker boob that use to be the good one so I’m not really sure what happened but now I’ve been trying to make sure he eats on each side equally but even when he eats on the slacker he isn’t really eating he just sucks and doesn’t swallow. And my nipple almost like doesn’t stay erect now for him to be able to latch easy. I don’t know what to do or how to fix it. I use my haakaa on both sides too when he’s eating but I don’t use an actual pump yet.