From being an outsider, he transformed himself into one of their own, just like those from the Jiuzhou Immortal Gate.
Using his origins from Jiuzhou, he established relationships with other Jiuzhou Immortal Gates, becoming one of their insiders.
Thus, everyone became insiders, and the Changqing Domain naturally became the home turf of Jiuzhou.
Shamelessly, Lu Yuan could even directly rename his sect the Nine Spirits Sect and take up the banner of reviving the Tao Inheritance.
Faced with such a situation, those Jiuzhou Immortal Gates would have no reason to attack the Taiping Dao.
If they insisted on attacking, they themselves would lose the justification.
And without that justification, they could no longer rally all Jiuzhou Tao Inheritances against the Taiping Dao.
The only ones who would really have issues with the Taiping Dao would be the current Five Sects of the Western Domain and perhaps add the Heavenly River Sect.