Choosing the right optional subject for UPSC requires careful consideration of a few strategic factors. Firstly, an aspirant should assess their interest and passion for a subject, as sustained engagement is crucial for deep learning. It's also essential to review the syllabus for overlap with the General Studies papers, as this can enhance efficiency. Moreover, candidates should consider the availability of resources and guidance, including coaching and study materials. Engaging with successful candidates from previous years can provide valuable insights into the subject’s relevance and scoring potential.