The Xiahou Clan's downfall has given Jiang Chen much freedom on the Myriad Abyss Island. His identity no longer needs to be hidden, nor do various details require so many precautions.
Traveling on the Xingyuan Flying Boat to the True Martial Divine Kingdom takes two to three days, based on the information provided by the Saint Ancestor of the Eternal Sacred Land.
The relationship between the True Martial Divine Kingdom and the Eternal Divine Kingdom isn't bad. The two sacred lands frequently communicate, and there are often many intermarriages.
In terms of relationship, the True Martial Divine Kingdom often holds the Eternal Divine Kingdom in high regard, treating it like an elder brother.
This is why the Saint Ancestor suggested Jiang Chen go to the True Martial Divine Kingdom.