While on The First Continent there might be powerful forces that Zhou Tian could not confront, he never intended to conquer that land immediately. The cold hard fact was that while he was someone to reckon with on his own continent, he would only amount to a small player on others'.
However, he may not be able to easily dominate on such a continent, but given Zhou Tian's current strength, there should be absolutely no problem for him to seize some marginalized territories there. In this way, barring any accidents, it should not be an issue for Zhou Tian to carve out a vast territory on that continent. In fact, his territory might even expand by several times when the two areas are combined.
Meanwhile, the continent where Zhou Tian later found the Magic Crystals might not be as expansive as The First Continent. But based on Zhou Tian's observations, this continent was just as substantial as his present one.