Connection timed out

On fresh droplet if i execute next commands:

hex@pcname:~$ ssh -i /home/hex/.ssh/id_rsa_2023digitalocean root@0.0.0.0
root@ubuntu-s-1vcpu-1gb-fra1-01:~# sudo apt update
root@ubuntu-s-1vcpu-1gb-fra1-01:~#
root@ubuntu-s-1vcpu-1gb-fra1-01:~# sudo ufw app list
Available applications:
  Nginx Full
  Nginx HTTP
  Nginx HTTPS
  OpenSSH
root@ubuntu-s-1vcpu-1gb-fra1-01:~# sudo ufw allow 'Nginx HTTP'
Rules updated
Rules updated (v6)
root@ubuntu-s-1vcpu-1gb-fra1-01:~# sudo ufw status
Status: inactive
root@ubuntu-s-1vcpu-1gb-fra1-01:~# sudo ufw enable
Command may disrupt existing ssh connections. Proceed with operation (y|n)? y
Firewall is active and enabled on system startup
root@ubuntu-s-1vcpu-1gb-fra1-01:~# sudo reboot

it is impossible to ssh -i /home/hex/.ssh/id_rsa root@0.0.0.0

back into my droplet, why? throws connection timed out