Discouraged

Hello breastfeeding mommies. I’m feeling a bit discouraged due to feeling my milk supply dropping. I came back to work when my baby was 2months and I’d pump at work and would pump a total of 4-6 oz now that I pump I’ll get 1oz from both boobs together. I hate seeing that my milk has decreased that I start feeling the need to stop breastfeeding. I feel like my breastfeeding journey is coming to an end. This is my first time breastfeeding and my baby is 4Months now. I have tried vitamins,lots of water intake,power pumping. Just seems like nothing is working. Did anyone go through this. Is my breastfeeding journey coming to an end. I’m just sad because I love the bond my baby and I have. Thanks in advanced!