Why does Percy try to keep a low profile (not be noticed) on the train?

Percy tries to keep a low profile on the train to avoid drawing attention to himself and potentially exposing his identity as a demigod. By staying unnoticed, he hopes to evade any threats from monsters or enemies that might be looking for him. Additionally, blending in allows him to focus on his mission without distractions or confrontations. Ultimately, he understands that being discreet is crucial for his safety and the success of his journey.