You can still power pump and take milk booster. Do drink lotsa water too! And is it possible that your period is coming back? Period eill affect supply temporarily - calcium supplement may help
Pump and latch more frequently. Eat milk booster food like milo barley 100 plus Edaname salmon Threadfin fish green papaya fish soup.
Drink and eat more, rest more, go back to power pumping and pumping every 2-3 hours (plus direct latching if possible).
Latch more and drink plenty of water!
Power pump , fluids, milk booster