Act as a [seasoned startup founder] with [5+ years of experience in B2B SaaS sales]. Craft a step-by-step negotiation strategy for securing high-value enterprise contracts. Include [industry-specific pain points], [pricing tier structures], and [risk-mitigation tactics]. Address how to handle objections like 'Your solution is too expensive' or 'We need custom features.' Provide real-world examples of successful negotiations, including [concession trade-offs] and [multi-year contract incentives]. Outline how to leverage [proof-of-concept results] and [customer testimonials] to build trust. Keep the tone assertive yet collaborative, emphasizing win-win outcomes.