The dashboard shows current status of AWS Account according recommendations to the 5 AWS Well-Architected Pillars. Level of detail depends on the AWS account type.
Goto Services > Trusted Advisor (https://aws.amazon.com/premiumsupport/trustedadvisor/ )
Check IAM access to remove unrestricted, or unneeded access
Ensure the service is able to recover from failure
See where service limits are being exceeded
reduce bottlenecks, and costs
Remove idle EC2 instances
AWS Organizations provides consolidated billing so that you can track the combined costs of all the member accounts in your organization. See: https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/useconsolidatedbilling-procedure.html