Aspirants can enhance their rhetorical skills for success in the UPSC interview by actively participating in mock interviews and public speaking workshops. Practicing articulating thoughts and responses clearly helps in building confidence. Joining debate clubs or engaging in discussions increases exposure to various viewpoints and improves communication abilities. Reading extensively on diverse topics also aids in expanding vocabulary and idea generation. Engaging with mentors who can provide constructive feedback on presentation style and content is crucial. Ultimately, consistent practice in articulation and developing a persuasive communication style are key for interview success.