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Sorry to hear this, I am not from DigitalOcean however I run a DigitalOcean backup business.
I would recommend to get your key back on the server you look at booting the droplet in recovery mode, once you are in recovery mode you can mount the file system, inside the mounted foldter (something like /mtn/root/.ssh/) and add your key. Shut the server down (not restart) go into DigitalOcean control panel and select a normal boot, then start the server.
Regards Simon SnapShooter DigitalOcean Backups