Thanks for writing back to us and sharing details further.
Glad to know that droplet's networking is rebuilt but these manual changes can be lost if you reboot the droplet at this particular time. So, we need to make these changes permanent.
You might want to fetch the droplet's metadata and compare it with the network configurations that you did manually. The below curl request will provide droplets metadata information that you need to compare with the configurations you did manually.
curl -s http://169.254.169.254/metadata/v1.json
After you verify that the same network configurations are shown you can run the command "cloud-init clean -r" which will rebuild the network configuration.
I hope this helps but feel free to write back if you have any concerns.
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