Have you checked whether your instance’s public IP address is the same as prior to the reboot? Unless you have attached an elastic IP address to your instance, its public IP address is subject to change, potentially preventing you from RDP-ing into it.
Can you also post your error message regarding the failed RDP attempt? It would help with narrowing down the issue.
Here are some useful references to check for your instance’s public IPv4 address and attach an elastic IP address through the AWS console:
OK should have tried this too LoL. Direct IP worked. AWS DNS not working?
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