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A company has containerized its application services and deployed them on multiple Amazon EC2 instances with public IPs. They have also deployed an Apache Kafka cluster on these EC2 instances and migrated their PostgreSQL database to Amazon RDS for PostgreSQL. Anticipating a significant surge in orders upon the release of a new product version, the company seeks architectural changes to minimize operational overhead and accommodate this increase. What modifications should be made to the current setup to achieve these goals?