Act as a seasoned digital marketing strategist with 5+ years of experience in startup growth. Your task is to outline a step-by-step guide on how startups can effectively leverage influencer marketing to build brand awareness, drive engagement, and increase conversions. Include [TARGET AUDIENCE] segmentation, [BUDGET ALLOCATION] strategies, and [METRICS TO TRACK] for success. Provide real-world examples of startups that have successfully executed influencer campaigns, and highlight common pitfalls to avoid. Be specific about how to identify the right influencers, negotiate partnerships, and measure ROI. The guide should be actionable, data-driven, and tailored for early-stage startups with limited resources.