Breastfeeding

Hi All , Good evening Is anyone has solution for my below concern I m trying my baby to putting on breastfeed Sometimes he takes interest and sometimes not Feeding through Vati is totally impossible whenever I try through vati he got so irritated After all this , is there any way increase milk supply through pump Currently I m only getting 20-30ml through both breast and sometimes it is 50 maximum...how about galactogogue or any other medication