In the past, Zhou Tian took no action due to his lack of strength. But once his strength was largely restored, it was impossible for Zhou Tian not to deal with the two hostile forces that opposed him.
Meanwhile, the actions of the two monsters provided a sobering lesson for Zhou Tian. Although these monsters were incapable of dealing with Zhou Tian, they were able to seek external aid.
Zhou Tian had barely survived their last encounter when the monsters had called for outside help. If given enough time to call for more reinforcements, Zhou Tian didn't know what kind of opponents he would have to face. While Zhou Tian was confident, he did not believe that he was invincible. Therefore, if possible, he would try to avoid the worst-case scenarios. Having realized that his hostile forces have external connections that he lacked, Zhou Tian wished to annex them before they could call for reinforcements.