To improve the ability to articulate thoughts during the UPSC interview, candidates should practice through mock interviews, focusing on enhancing clarity and confidence in their responses. Engaging in discussions with peers and mentors about various topics, including current events and personal experiences, can also help refine communication skills. Additionally, maintaining a habit of reading daily news and articulating opinions on it prepares candidates for spontaneous questions. Recording practice sessions can provide insights into areas requiring improvement while boosting overall presentation abilities.