"Expired" doesn't seem to be the right word here. Your website is definitely not responding; but as per the comments above you (or someone) will need to log into the AWS account and look at the instance that hosts your site to determine what is wrong with it.
The AWS people (presumably support) that you spoke to can confirm that the environment and the instance is running; but that doesn't mean that it is functioning correctly. The support team (in fact, no-one) at AWS has access to your instance so it's something that needs to be fixed by someone with administrative access to it.
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