Fang Xi, after becoming a Transcendent God, deemed himself invincible in the Mortal Realm.
Therefore, even though he had the Ascension Platform and even possessed a series of Treasures of Void such as the Devil-locking Tower, especially protected by the Treasures of All Heavens, and was one hundred percent confident in ascending to the Earth Immortal Realm successfully, he would not act rashly!
Having had such a hard time becoming the supreme power in the Lower Realm, invincible under the heavens, he wouldn't immediately rush to the Earth Immortal Realm to seek abuse — that wasn't his style!
He had made up his mind to stick around in the Mortal Realm for the long haul, at least until he reached the Perfect Transcendent God stage, before he would consider ascending.
One must be prepared for danger in times of peace!