The Yan Family patriarch, like Li Mingwu, also boasts a Nascent Soul Peak Cultivation.
When Lin Jing sought an alliance with him, even Li Mingwu would certainly have reservations.
Furthermore,
Given that the Yan Family patriarch himself is at the Nascent Soul Peak without advancing into the Solidifying Body Realm, it is likely due to a deficiency in the True Spirits of the Five Elements.
In the Five Elements Ruins, there should exist the True Spirits of the Five Elements, and the Yan Family patriarch would surely find such a temptation irresistible.
...
Not long after,
Li Tangyu, along with several others, arrived and under Lin Jing's arrangement, they left together for Bihai City.
Lin Jing also departed from Li Yan Island, steering the Flying Boat directly towards Spirit Rock Island.
As for Li Yan Island, there was no need to bother with it.