How can I increase my milk supply?

Is it just over for me? I’m trying everything to get a better supply. Just when I think I’m heading in the right direction I go to pump and get LITERALLY NOTHING. Yesterday I was getting close to an ounce each time. I know that’s not a lot but for me right now it is. I’ve literally been trying everything. Any tip or trick I’ve done. Is it just not gonna happen for some women? I can sit here and squeeze milk out all day long and it fly across the room, but I can’t do that for more than a few minutes and it hurts my hands so bad. I’m ordering brewers yeast tomorrow, that’s kinda the last thing I can try. Idk what else to do. Someone give me some kind of magic concoction to make more milk. And yes, along with all the supplements, hydration, everything, I’ve been pumping every 3 hours. Sometime at night I can’t hear my alarm and I don’t pump for 6 hours but is that REALLY what’s stopping me from making milk? Ugh help PLEASE.