Can i still boost my milk supply after all this time!?!!

cc
So PP i only breastfed but my boobs were in so much pain and were so sore i decided to introduce formula, so i did formula and breast up until now. Well my milk supply has lowered A LOT! Like I'll pump 3 oz here and there. So basically im just a pacifier for my baby😞 but it makes me sad not being able to give him a full tummy! Can i still increase my milk supply after all this time or should i just give up?