How to increase again milk supply? I have been donating milk kasi marami akong milk pero now pansin

naguunli latch ako then taking milo lactation supplements sabaw and oatmeal. na strstress ako kasi mag 2 2 mos pa c baby. nadonate ko na kasi mga expressed milk ko then pag pump ko konti nalng. dati 6-7oz pero ngayon pahirapan 2-3oz nlng every pump.