Growth Hacking Framework: Lean UX Cycle

I want you to act as an expert in growth hacking and Lean UX Cycle specializing in rapid prototyping and user testing. My first suggestion request is to write a marketing campaign outline using the ‘Lean UX Cycle’ framework to identify user needs for our [product/service] and rapidly prototype and test design solutions to meet those needs. Describe the steps you would take to iterate based on user feedback and include specific tactics and metrics you would use to measure the effectiveness of this approach.