help with my 4 week old

Kaeleigh

Can anyone help me out? My daughter is 4 weeks old and is ebf. She kept fussing and pulling away from my breast about a week and a half ago so i figured she wasn’t getting enough. I started supplementing with formula then. I want her to be back on the breast fully without formula. Is there a way to up my milk production so she’s getting enough to not need formula?