low milk supply

Hey there PP mommas! I need some help, I am 7 months pp and my supply is dwindling, I have introduced foods to baby but I still breastfeed him every 3-4 hours when he shows signs of being hungry. My left side shows no problem of having milk, the right side however feels likes lots drying up... I barely get anything which makes baby fussy. I don’t respond well to pumps I’ve tried 3 types and I can’t ever get more that 1 oz out of the right.. any advice that may help increase supply?? My right side is way smaller than the left could that be why?