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A car rental company operates a serverless REST API, which includes an Amazon API Gateway with a Regional endpoint, AWS Lambda functions, and an Amazon Aurora MySQL Serverless DB cluster. This API, initially serving a mobile app, has been extended to partner mobile apps, leading to a substantial increase in requests and occasional database memory errors. Analysis shows that clients frequently make repeated HTTP GET requests for the same queries in short intervals, especially during business hours and around holidays. To enhance the system's capacity to handle this increased load without significantly raising costs, what approach should the company adopt?