I need your advice and perspective from the outside to understand what happened...

Imagine a person comes to you, saying they need your help because their business is struggling, and they might have to shut it down soon. They've heard that business coaching could be beneficial, so they are open to hearing your advice. If they can't turn things around within a few months and improve their business to bring in more money or find new customers, five of their current employees will lose their jobs. After listening, 𝘆𝗼𝘂 𝘂𝗻𝗱𝗲𝗿𝘀𝘁𝗮𝗻𝗱 𝘄𝗵𝗮𝘁 𝘁𝗼 𝗱𝗼 𝘁𝗼 𝘀𝗮𝘃𝗲 𝘁𝗵𝗲 𝗯𝘂𝘀𝗶𝗻𝗲𝘀𝘀. You give them your price and suggest they take some time to think about it before making a decision. The customer leaves, and after four months, their business closes down. In your opinion, whose fault is it? Is it the client's fault for not getting back to you, or is it your fault for not following up and pushing the client at the right time to close the deal and help them take action?