You can use the following tutorial to access your rdp without remote desktop and fix it:
https://aminserve.com/how-to/vnc-console-access-rdp-vps-services/

there are 3 methods and vnc viewer method is the most reliable one.

If you can not fix it, we can reinstall the OS. Your service will be like the first day you received it, so everything inside it will be removed.