Can you check if your security group in the AWS security?
You would need to open the port like 80, 443 to get public access.
Also, I can see the IP 3.7.7.211 ls accessible and showing NginX already.
So you're supposed to open the IP, it would work.
Here's the instruction: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-security-groups.html
You would need to open the other port also, like:
Those are the required port to use aaPanel effectively.