Zhao Fu did not decide to directly attack the four directions and instead decided to convince them to surrender. With Great Qin's strength, as well as the Inner Great Wall, it would be quite easy for Great Qin to defend against their attack.
Moreover, with Great Qin's massive power, Zhao Fu had the confidence to ask them to surrender. The system main city's City Lords most likely knew that the real world would be devoured by the Heaven Awaken World, meaning that they would not be able to remain neutral.
When that time came, the players would still have the advantage, because players had become more powerful and no longer feared the system main cities. In the future, the system main cities would be in a worse and worse situation.
Now that it was quite a few stages into the Chaotic World, there were battles between nations, and they were about to reach the final stages.