you can try it:
So, my attempt would be now - to start up via the console, i.e. connect the screen and keyboard and then:
Log in as root, then edit the file nano /etc/ssh/sshd_config.
PermitRootLogin no -> to PermitRootLogin yes
(when done push STRG+X and "Y" followed with Enter).
finaly restart SSH - sudo systemctl restart sshd