Question on AWS Cost Optimization and Resource Management

This is a very vast question. It might be helpful to know which services you are using. For example, on EC2, I would suggest using compute optimizer to find the right instance type and size and leverage autoscaling groups so that as you need resources they will be added automatically.

I suggest checking out the Cloud Financial Framework (CFF) which goes through many services and offers best practices for those.

https://catalog.us-east-1.prod.workshops.aws/workshops/86e30fc2-daf4-4708-8720-347e2b312075/en-US