Aspirants can improve their essay writing skills for the UPSC by practicing regularly, focusing on structure, and developing a coherent argument. Reading exemplary essays and understanding their framework can provide useful insights. Employing techniques like outline creation before writing can help organize thoughts effectively. Feedback from mentors or peers is invaluable for refining writing styles. Additionally, staying updated with current affairs allows candidates to incorporate relevant examples and viewpoints, thereby enhancing the depth of their essays.