As a product manager, it's important to keep a close eye on engagement metrics, such as daily active users and time spent on the platform. A 10% day-on-day decrease in engagement is a significant drop and requires immediate attention. To address this issue, I would start by conducting user research to better understand why engagement is decreasing. This could include surveys, focus groups, and one-on-one interviews with users. Based on the feedback received, I would work with the engineering and design teams to identify potential solutions to improve engagement. One potential solution could be to introduce new features or improve existing ones to make the platform more engaging for users. Additionally, we could explore ways to better personalize the user experience to increase relevance and value for individual users. Another potential strategy could be to invest in marketing and user acquisition efforts to attract new users to the platform. This could include targeted advertising campaigns, referral programs, and strategic partnerships. Overall, addressing a 10% day-on-day decrease in engagement requires a multifaceted approach that involves understanding user needs, identifying potential solutions, and executing on a comprehensive product and marketing strategy.