Do you think it is challenging to maintain when it gets medium-sized?
It's the same with Calathea Dottie when it is tiny, you just put it in indirect sunlight, keep the temperature at 70 to 80 degrees, and ensure the humidity is between 50 and 70 percent. Finally, make sure the pot has good drainage.
A peat soil mix might help it grow big and strong! And don't forget to make sure the soil has a soil pH that's acidic to neutral, so it gets all the nourishment it needs.