This Great World, in the end, is not something Su Yang and the others can consider for the time being. Protecting the people before them is their most critical task.
The Nine Realms are where Su Yang and the others originate. When their strength was insufficient, they simply didn't have time to consider the matters of this Great World, and could only first safeguard the Nine Realms.
As for the matters of the Great World, the entirety of the Human Clan, they must at least cultivate to the level of Saint Emperor to even begin considering.
After discussing with Saint Venerable Yuqing, Su Yang coordinated with the other Nine Realms cultivators practicing in the Endless Starry Sky, including the Saint Venerables, to return together to the Nine Realms and start considering moving the cultivation sites to the World Melting Furnace.
Of course, this change of cultivation site does not mean sending all cultivators into the World Melting Furnace.
