Long, long ago, the deities of the Odro continent realized that this land could no longer be expanded by "encircling the sea to create fields," nor was there a need to extend it any further.
But everyone could add depth to it.
How so?
The many deities could build countless small worlds connected to it, and if no one minded the effort, these small worlds could become as large as the Odro continent itself.
How was the size of the Odro continent determined?
It's like wild animals each having their own territory; a territory too vast is of no significant use to oneself. When the Creator God made this continent, He deemed that its area was sufficient for His amusement. Anything larger would be purely superfluous and wasteful, so He stopped.
So did He have no desire to explore the world? Did He not wish for an infinite, boundless world?