The reason Zhou Tian did not dare reveal his true strength before, even when facing the siege of those Divine Race experts, was because his sole thought was how to escape. From the beginning to the end, he never had the idea of fighting them. All of this was not because Zhou Tian didn't want to fight those Divine Race experts, but simply because the opportunity was not ripe. Zhou Tian could not let the Divine King who ruled that world at the time discover his existence and ultimately cause his plan to fail.
As a result, due to not daring to let that Divine King know of his existence and what he was doing, Zhou Tian, whose strength was actually above that of the Divine King at the time, had to hide his strength. Even when facing those Divine Race experts who were very weak compared to him at the time, he had no choice but to flee.
