Milk production problems

I have to fight my baby to latch (and stay latched) so I've been exclusively pumping. I pump almost every 45 mins for the last two wks since he's been born , been taking milk thistle , mothers milk tea , and staying hydrated . What am I doing wrong to barely get an oz out of each boob? I've been having to supplement a lot and I hate it. I started fenugreek today I hope it works