bf journey

i feel quite down as i suspect my milk production is slowing down tremendously. my bb is coming to 4mths and i only started to dl when she was 2mths old, previously pumping. I suspect i wasnt latching on enough/pumping enough hence the slow down. i tried milk boosters but it still wasn't enough for my lo.. I'm quite upset that the fact ive to stop bf the day i cannot give bb enough milk she drinks about 150ml of breast milk nowadays and sometimes it isnt enough! and when i latch she will cry after 5mins i assume is bc no milk :( i rly hoped i could have bf until she was 6mths