A third theme could be the power of relationships. Maybe on the journey home, the main character is helped by old friends or family members they meet along the way. Or perhaps the story is about reconciling with estranged relatives, emphasizing the importance of human connection during the process of going back to one's origin.
Another theme might be the significance of place. Since it's about the way home, it could explore how a particular location holds memories, family, and a sense of identity. For example, the story could show how the protagonist's hometown has changed over time but still has that special place in their heart.