Mistaking Chu and Xinghan

Traveling through the end of the Qin Dynasty: I wanted to prosper the Han Dynasty, but I took Xiang Yu away. My name is Lin Xiaochuan. I have only one mission: to ensure that Liu Bang ascends the throne. The problem is, before Liu Bang was found, Xiang Yu first regarded me as his teacher. I taught him military discipline, employment, recruitment, and city management. Originally he was just trying to survive, but looking back - the overlord who was the least able to win people's hearts in the history books turned out to be more and more like a wise king. Now, before Liu Bang raises his troops, Xiang Yu becomes increasingly difficult to lose. So, how can this guy still thrive?