Follow SSH hardening guides provided by reputable sources such as CIS or NIST to implement additional security measures specific to your environment.
Disable the SSH direct root login to stop unauthorized users from having complete access to the system. Rather, utilize a standard user account before switching to the root user.
Restrict SSH access to only the users who need it. Use firewall rules or TCP wrappers (e.g., iptables) to allow SSH connections only from specific IP addresses or ranges.
Regularly update the SSH software and related packages to patch any known vulnerabilities and ensure the latest security fixes are applied.
Check SSH logs on a regular basis for any suspect activity, such as multiple failed login attempts or strange login patterns. Set up alerts for any such events to take timely action.