sudden drop in milk supply

my baby is 8 months old , still nurses during the night and throughout the day combined with solids but i can’t seem to pump anymore . i used to be able to get at least 4-6oz to put in the freezer but now my freezer stash has ran out and i’m not getting any more than 1-2oz or less when i pump . i haven’t changed my diet or anything like that . i’ve tried using different settings on my pump , power pumping and hydrating more but i just can’t get any extra milk . any ideas what’s going on ?