Regularly review and audit IAM user accounts and permissions. Implement the principle of least privilege, granting users and services only the permissions they absolutely need.
Enable MFA for all IAM users to add an extra layer of authentication. Apply MFA to the AWS Management Console, CLI, and API access.
Use AWS Organizations to centrally manage and govern multiple AWS accounts. Implement service control policies (SCPs) to set permission guardrails across accounts.
Enable encryption for data at rest using services like AWS Key Management Service (KMS). Utilize SSL/TLS for data in transit.
Enable AWS CloudTrail to log all AWS API calls and monitor for suspicious activity. Use Amazon CloudWatch to monitor and set up alarms for abnormal behavior.