How would you launch a product for the proactivity space in Gemini?

Focus on outlining a clear product launch strategy specifically tailored for the proactivity space within Gemini. Start by defining what "proactivity" means in this context and identify the target user segments that would benefit from such a product. Discuss the key features that would drive user engagement and retention, and how they align with Gemini's existing ecosystem. Consider potential partnerships, marketing strategies, and metrics for success post-launch. Be prepared to address potential challenges and how you would mitigate them during the launch process.