7 months and only pumping 5 ounces

Hey, my LO is 7 months old and is primarily formula fed and eats solids. I still pump once a day roughly 5 ounces and give her that every morning and sometimes she still gets nightly breastfeeding sessions. My question is... can I start drinking more water and cluster pump to get my old supply back?

I used to pump close to 30 ounces but between work, my older daughter, period starting back and vacationing I really saw a HUGE drop.

I still pump bc I want to give her immune support. But if I cant increase my supply, I fear I wont make it even another month even though I want to make it to a year.