Key elements of a successful tech startup pitch include a clear value proposition, a well-defined target market, and an understanding of the competition. Startups should clearly articulate how their product or service solves a specific problem, backed by evidence such as market research and potential demographics. Demonstrating a feasible business model and outlining financial projections are also crucial. Furthermore, showcasing a talented and cohesive team can instill confidence among investors. Finally, a compelling narrative that highlights the passion and mission behind the startup can make a lasting impression.