So my Monstera finally put out a fenestrated leaf after months of just solid ones, and I'm honestly not sure what I did differently

So my Monstera finally put out a fenestrated leaf after months of just solid ones, and I'm honestly not sure what I did differently. I've got it by an east-facing window in my flat, water when the soil feels dry, nothing fancy. I'd love to know if anyone else's took ages to develop those signature holes, or if I was just being impatient. Mine's about two years old now and finally feels like it's settling in properly.