At what point do you just stop breastfeeding and go to strictly formula?

Right now I’m pumping but I barely get 1-2 ounces combined over the span of two sessions, which obviously isn’t enough for my 5 week old who’s eating 3-3.5 ounces every 3 hours lol.

So I’m wondering, should I just give it up and exclusively give her formula? I hate even thinking about it because I wish I could give her breastmilk only (trust me I’ve tried almost everything to increase my supply lol).