When i looked into the auth.log file, i could see that somebody hacked into my server and was trying to access various ports of different ips.
I tried to disable the root login and password logins. However even with the private key that i have now it does not work.

login as: root
Authenticating with public key "rsa-key-20190413"
Passphrase for key "rsa-key-20190413":
Server refused public-key signature despite accepting key!

This is what it says. Do i have to delete my droplet now and create a new one where i don’t keep the passphrase for the ssh key or is there a way to get in.