Aspirants can build a diversified knowledge base relevant to the UPSC syllabus by engaging with a variety of sources such as books, academic journals, online courses, and current affairs. Following a structured study plan that encompasses different subjects—history, geography, polity, and economics—will ensure a well-rounded understanding. Joining discussion forums or study groups can provide diverse perspectives and enhance comprehension. It's important to focus on the interconnections between topics, as the UPSC emphasizes holistic understanding over rote memorization, allowing aspirants to apply knowledge contextually.