Upon his return from First City to Emperor City, Lin Huang went into closed-door cultivation at the first possible opportunity.
However, this round of closed-door cultivation was not aimed at improving his abilities; rather, it was for him to consider how he might try to communicate with the world will.
According to the Emperor's Heart, it was possible for anyone who had mastered Rule Bending Power to communicate with the world will of the gravel world.
However, the Emperor's Heart had not disclosed how to communicate with the world will. It had only mentioned that the world will's willingness to communicate would vary from person to person.
As for how to refine and integrate the God Territory fragments, the only thing the Emperor's Heart had said was that entrance to the World Core would only be permitted by the world will if one obtained sufficient approval from the world will itself.
In other words, this was all a game of currying favor.