Create a new, unique password for Aternos . If you used the same password on other sites (like Gmail or Twitch), change those immediately as well.
Look through your Server Logs for unusual logins or commands that you didn't execute. Aternos.org 860k.txt
Use the Aternos Account Settings to add an extra layer of security that a simple password list cannot bypass. Create a new, unique password for Aternos