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Hello.
It may not be available depending on the instance type, but have you tried connecting via serial console?
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-serial-console-prerequisites.html
You may also want to check the EC2 system log and check for any errors using the steps in the document below.
I think there is another way to take a snapshot and recreate EC2.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/troubleshoot-unreachable-instance.html#instance-console-console-output
I was originally on free tier but have made the plunge to a t3, which has the serial console available. There was a faulty program consuming all the memory and causing the ssh to time out - it is now resolved. Thank you for the tip!