To keep the foreigners at bay, one must first stabilize within.
After Yu Xian subjugated the Great Sun True Monarch, it signified that the largest opposing force within the Profound Sun Sect was completely disintegrated, allowing him to fully control this massive organization that had been inherited for thousands of years.
It's just that it is still early days, and the ruling foundation of the Great Unity Association is not yet deeply rooted in the entire Profound Sun Region; otherwise, he could turn the Profound Sun Sect into a department under the administration of the Great Unity Association in minutes.
Though nominally unchanged, in reality, it had become quite different.
For instance, the Profound Sun Sect no longer recruited disciples openly. All those who had been recruited were no longer retained at the Profound Sun Sect Mountain Gate but rather dispatched to various places to truly serve the people.