Aspirants can improve their public speaking skills for UPSC interviews by engaging in regular practice. Joining platforms like Toastmasters or participating in debate clubs can create opportunities for speaking in front of an audience. Recording speeches and analyzing them helps identify areas for improvement. Additionally, practicing impromptu speaking on random topics enhances spontaneity and confidence. Understanding body language and maintaining eye contact during your speaking practice can significantly impact impression. Moreover, seeking constructive feedback from peers and mentors can facilitate actionable insights, fostering growth in effective communication.