What I think is this: You should give up looking for lost cats and start searching for the other half of your shadow.
In Haruki Murakami's "Kafka on the Shore," the idea of seeking lost things takes on a deeper meaning. The quote suggests that rather than focusing on lost possessions or beings, like cats, one should instead delve into the more profound aspects of existence, such as understanding oneself or searching for one's other half. It implies that the journey toward self-discovery is more important than finding superficial items.
This perspective encourages readers to shift their focus from the mundane to the essential. The "other half of your shadow" symbolizes the parts of ourselves we often overlook or the dreams and goals we have yet to pursue. By prioritizing introspection and personal growth, we enrich our lives more than we would by merely searching for what is lost in the physical world.