When a customer's usage is in decline, it is important to assess whether the solution still aligns with their desired outcomes and to review the implementation plan to ensure it is being executed effectively. This approach helps identify any gaps between the solution's capabilities and the customer's needs, as well as any issues in the implementation process that may be causing the decline in usage. References: Cisco Customer Success Manager documentation emphasizes the importance of aligning solutions with customer outcomes and regularly reviewing implementation plans to ensure success.