Upping supply

I’m 1 week & 1 day postpartum and I’ve been mixed feeding (long story as to why).

Is there anything I can do to up my supply as currently her feeds are 80% formula and 20% breastmilk.

I am only getting 60ml when I pump and she’s drinking 90ml of formula every 3/4 hours.

I got only 30ml when I pumped last night and my boobs aren’t as firm as when my milk first came in. 😢 I feel like I’ve ruined it now to breastfeed her mainly as my milk will never be what she needs.