Takemichi's experiences in the past play a significant role in shaping his understanding of himself and his place in the world. By revisiting his past through time travel, Takemichi is able to reflect on his actions, decisions, and relationships, which in turn helps him understand his own motivations, strengths, and weaknesses. This self-awareness empowers him to make better choices and strive for a more positive future. Additionally, witnessing how his actions in the past have impacted the world around him gives him a sense of responsibility and purpose, driving him to make a difference and create a better world for himself and those he cares about.