Increase supply?

I have always struggled with my supply but now that my twin boys formula is on backorder I REALLY need to up my supply. I have PCOS and have tried more water, power pumping, Gatorade, lactation cookies, body armor, oatmeal, oat of the swirled, fenugreek, mothers milk tea, brewers yeast, honest postnatal, metoclopramide, and domperidone. Currently only take domperidone and only get a few drops (I have consistently been pumping and my boys are 8 months) PLEASE HELP what has worked for you. My boys cant tolerate any other formula