For writing essays in the UPSC Mains, aspirants should adopt a structured approach that includes planning, clear argumentation, and cohesive flow. Starting with a compelling introduction sets the context, followed by body paragraphs that logically present arguments and counterarguments. Conclusion summarization is essential to encapsulate the essence. Candidates should also practice time management to ensure completion within the allotted timeframe, enhancing clarity and coherence in their writing.