Strip out sunk cost

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I have already invested {{sunk}} in {{project}}. I am deciding whether to continue. Strip out the sunk cost: (1) if I faced this choice for the first time today with nothing invested, what would I pick; (2) list my real reasons for continuing and classify each as 'too much invested to quit' versus 'genuine future value'; (3) if I continue, how much more is needed, what is the success probability, and what is the expected return; (4) define an explicit stop condition — the signal that means quit.

我在 {{项目/关系/投入}} 上已经投入了 {{已投入}}，现在考虑要不要继续。请帮我做沉没成本剥离：1) 假设我今天第一次面对这个选择，手上没有任何已投入，我会怎么选；2) 列出我继续坚持下去的真实理由，逐个判断哪些是「已投入太多不甘心」，哪些是「未来确实有价值」；3) 如果继续，未来还需要投入多少、成功概率多少、期望回报多少；4) 给一个明确的止损条件（什么信号出现就停）。