In this scenario, my initial action would be to verify the data. Once confirmed, I would conduct a thorough analysis of user behavior, paying special attention to the group that has ceased using Salesforce. I would examine the intervals between login sessions, the utilization of various features within Salesforce, and the duration of usage for these features. Moreover, any available user feedback would be essential for assessing user satisfaction levels. I would also look into recent changes to the product or support protocols—such as features, pricing, and policies—as these may contribute to customer dissatisfaction. I will further analyze the timeline of the 35% decline. If the drop occurred suddenly, it could indicate a specific incident like a system outage or significant operational change. Conversely, a gradual decline might suggest increasing user dissatisfaction. Based on the insights gathered, I will collaborate with the relevant departments to address the issue, whether by enhancing specific features, revising policies, or improving customer support. Overall, my strategy is focused on data analysis and prioritizing user needs.