Cannot connect to AWS EC2 instance[Wordpress]

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Can anyone help me pls? I'm developing the WordPress website in localhost and I'm going to deploy it on AWS. So I open a new EC2 instance and prepare for all migration. But now I cannot connect to instance anymore. I don't know what happen and I just transfer the domain to my site. No more configuration. When I try to connect instance, it just warns me that "Log in failed. If this instance has just started up, wait a few minutes and try again. Otherwise, ensure the instance is running on an AMI that supports EC2 Instance Connect."

The instance has been started up for a few days but the problem is still here. I hope someone can help me. Thanks a lot.

wordpressamazon-web-services
What is the OS of the ec2 instance? Have you whitelisted your public IP address on the security group assigned to it? – Allan Chua
See Troubleshoot connecting to your instance. – jarmod
Have you ever been able to access it? Do you have the keypair and can't you connect via systemmanager? – Riz
Is the instance running an "AMI that supports EC2 Instance Connect" as stated in the error message? Have you tried any other method of connecting? – Mark B