Problem for access eks from another IAM user

I think the easiest way to gain access to cluster is to re-create the IAM user you used to create the cluster. That should give you access to edit config and grant access to other users as described in https://docs.aws.amazon.com/eks/latest/userguide/add-user-role.html

Or if that is not possible, aws eks update-kubeconfig could reset the configuration. See https://awscli.amazonaws.com/v2/documentation/api/latest/reference/eks/update-kubeconfig.html