I did not get an email of my Droplet's root password

During Droplet creation, you have the option to select a root password. After creation, we do not send this password to the registered email address.

You can reset a Droplet’s root password by following our How to Reset Droplet Root Passwords tutorial.

There may be an issue with the autoscale pool or Droplet configuration, the VPC network’s size, or resource limits on the team or datacenter.
Health checks often fail due to firewalls or misconfigured backend server software.
Boot the Droplet from the recovery ISO, then connect using the Recovery Console and delete files to free some disk space.