If I were tasked with diagnosing a 35% drop in usage on Invision, my first step would be to determine whether this decline is consistent across all user categories or if it's confined to a particular group. For example, are premium subscribers experiencing the same level of impact as free users? I would analyze the usage data, segmented by as many user demographics as possible. Next, I would investigate whether any recent changes to the application, such as updates or feature alterations, align with the observed decline. After identifying potential causes, I would gather user feedback to uncover any issues we may have missed. This could be done through surveys, user interviews, or by using analytics tools to monitor user interactions on the platform. Once the primary issues have been pinpointed, we can create a strategy to address them. This may include software fixes, UI/UX enhancements, better customer engagement, pricing changes, and so on. The effectiveness of these actions would be assessed by tracking usage rates after implementation. In the long run, to avoid similar issues in the future, I would recommend implementing a more rigorous quality control process prior to releasing updates and actively soliciting user feedback for ongoing enhancements.