I've had my peace lily for about eight months now and I'm still figuring out its watering schedule

I've had my peace lily for about eight months now and I'm still figuring out its watering schedule. It droops dramatically when thirsty, which is honestly helpful for a beginner like me, but I worry I'm either overwatering or underwatering the rest of the time. Mine's in medium indirect light and seems happy enough, but the leaves aren't as glossy as I've seen in pictures. Should I be fertilizing more, or is that just how Spathiphyllum wallisii looks in regular homes?