A business has an application with a REST-based interface that can collect data from an external provider in real-time. Once received, the app processes the data and stores it for further analysis. The application runs on Amazon EC2 instances. The third-party vendor received numerous 503 service errors that were unavailable while sending data to the app. As the volume of data increases, the computing capacity reaches its maximum limit, and the application cannot process all requests. What design should a solution architect recommend to provide a more scalable solution?