Acquire an EC2 Instance Savings Plan for the EC2 instances, a Compute Savings Plan for Lambda to cover the anticipated minimal usage of the Lambda functions, and reserved nodes for the MemoryDB cache nodes.

Opt for a Compute Savings Plan for the EC2 instances, set up Lambda reserved concurrency to manage the expected Lambda function usage, and reserve nodes for the MemoryDB cache nodes.

Implement a Compute Savings Plan to encompass the total anticipated costs of the EC2 instances, Lambda functions, and MemoryDB cache nodes.

Choose a Compute Savings Plan for the EC2 instances and the MemoryDB cache nodes, and configure Lambda reserved concurrency to handle the expected Lambda function usage.