Li Xiaoya still had to enter the Seabed Time City to continue cultivating, while Liu Xian'er and Zhang Hong cultivated in their cave abode. Although both women were at the Mighty One Stage...
However...
Liu Xian'er was at the late Mighty One Stage, while Zhang Hong had only just advanced to the Mighty One Stage...
The reason Liu Xian'er and Zhang Hong had not gone to find Li Xiaoya back then, but had instead been kept at the Immortal Court by the Immortal Sovereign, was that Zhang Hong had not yet reached the Mighty One Stage. Li Xiaoya had been at the crucial juncture of breaking through to the Immortal Tribulation Stage, and the Immortal Sovereign had not wanted the two women to disturb him...
The two women naturally understood, so, for once, they stayed at the Immortal Court to cultivate... This would allow Zhang Hong to reach the Mighty One Stage, and Liu Xian'er knew she could not selfishly go see Li Xiaoya, so she guarded Zhang Hong during her cultivation...
The Immortal Sovereign, however, seemed particularly fond of Liu Xian'er and allowed her into the place where he researched the formation Dao, leaving her overwhelmed by the favor...
And later...
With the Immortal Sovereign's elixirs, spiritual qi, and cave abode to aid her cultivation, Zhang Hong successfully broke through to the Mighty One Stage in just over a hundred years. However, she then needed several more decades of seclusion to stabilize her cultivation. In truth, she could already have seen Li Xiaoya then... He had also successfully reached the Immortal Tribulation Stage, emerged from the Time Chamber, and was cultivating in seclusion...
During that time...
True Immortal Cold Moon knew nothing about this. True Immortal Heavenly Feather, whom Li Xiaoya had asked him to consult, was busy with