It looks like port 443 (HTTPS) is not open to the internet on your website or your web server is not actively listening on port 443. Please ensure that Port 443 is open on your Security Group to 0.0.0.0/0 and that your web server is configured to accept connections on Port 443.
Depending on if your website is running on Lightsail, Elastic Beanstalk or EC2 the configuration settings may be slightly different.
Edit: Since you mentioned using S3 to host the static website in the comments, S3 does not support HTTPS/SSL. You must use CloudFront in front of the S3 static website to utilize SSL.
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