insufficient milk supply?

supply dropped by a lot. now every time i pump it's usually just enough for my baby next feed. and on days i pump lesser than 100ml i get very upset bc my lo is 2mths old and she drinks 140-160ml per feed every 3hrs! feelinvery stressful and disheartened.. sometimes i drag the timing, instead of pumping 3hrly i pump every 5hrs in order to hit the 100ml> if not i only get 60-80ml every 3hrly. i latch my lo every morning though and im drinking red dates with lance asiabell. milk still doesn't seem enough... during confinement, i always could freeze extra but now ive used up all my frozen milk (april till may, apox 150ml each packet 3-5 packet a day). any breast feeding mummies can advice? i rly want to continue until lo is at least 6mths but hope to last until she is 1yrs is best scenario..