I Want to Be the Godfather of Science and Technology in Ancient Times

Imagination crowdfunding, all book friends can help me find out how to set up opponents to be more exciting. The novel is a time-travel story. An engineering doctor returns to ancient times and establishes his own power. He spends two volumes laying the groundwork. Now he is writing the third volume. The war begins. The emperor personally conquers Song Huizong and is captured by the enemy. Then the world was in chaos. The prime minister in the Central Plains cosplayed as Cao Cao and established a new emperor to control the emperor to control the princes. The protagonist cosplayed as Liu Bang and seized Tongguan and became the king of Guanzhong. The king of Shu in Shu broke away from the court control. Now I want to set up the last opponent. In the southern region, it is better to be a peasant uprising like Chen Sheng, Wu Guang or Zhu Yuanzhang, or a feudal official like An Lushan.