Help!

I think my BM getting reduce ? 10 mins of pump can’t even get 1oz ?? LO is 5 months old and love to BF when I’m at home. I’m a full time working Mom... every 3 hours will pump BM and DL at home. I have tried so many milk booster but everything seems like not working. Is it the time already that I have to stop BF? I want to BF her till she 6 months at least ??