help!! Zz plant is dying

Bought it recently off a seller and it already had some yellow leaves. I think I have overwatered the plant. I’ve only watered it once since receiving it. When I’m working from home, my roller shutters are open to allow light to come through. But I stupidly left my house for three days and had no sunlight coming in. I come back home only to see that my zz plant looks worse…

Is there any way of saving it?

Thanks