Lightsail in safe mode

once a Windows instance in Amazon Lightsail is booted into Safe Mode without networking, you cannot access it via RDP, as the networking components are disabled.

but maybe you can try the following

Create a snapshot of your Lightsail instance Create a new Amazon EC2 instance Create an Amazon EBS volume from the Lightsail snapshot Attach the Amazon EBS volume to the EC2 instance Access the EC2 instance and modify the boot settings

• change registry settings
• • Click "File" > "Load Hive" and navigate to the "Windows\System32\config" folder on the attached volume.
• HKEY_LOCAL_MACHINE\Offline_SYSTEM\ControlSet001\Control\SafeBoot
• Modify the "Option" value to "2" ( Safe Mode with Networking)

do not know it works but worth to try in your case