To reduce the cost of a system, you can match supply with demand, and that supply should be sufficient supply either it is provisioning the resources or individual failure of resources. When the demand is varied or fixed, then automation helps to ensure that it will not affect the cost significantly. In that case, you can use managed services.
In AWS, you can automatically match demand by provisioning resources for Auto Scaling, and using the buffer and time-based approaches to allow new resources or remove the existing resources.
To match supply and demand, you should consider your usage patterns and the time required to provision new resources. You must ensure that whatever you pay is used and avoid under utilizing ...
