For preparing the essay topic for UPSC Mains, candidates should adopt strategies like thorough research and brainstorming ideas. Start by outlining central themes and subtopics related to the prompt. Analyzing previous years' essay papers can provide insights into recurring themes and expectations. Crafting a structured outline before writing fosters clarity in argumentation. It's also beneficial to gather supporting evidence, relevant examples, and case studies to bolster arguments. Regularly practicing essays under timed conditions ensures that candidates refine their writing fluency and develop a confident approach to various topics.