In order to stand out in a crowded market, sustainable startups need to differentiate themselves from their competitors by emphasizing their unique value proposition. This could include highlighting the environmental impact of their products or services, showcasing their commitment to sustainability, and using sustainable materials in their operations. They can also partner with other environmentally-focused organizations to increase their visibility and impact. By creating a strong brand identity and building a community around their brand, sustainable startups can establish a loyal following and differentiate themselves from their competitors.