What should i do to make my SSH server more secure?

Answer 1

https://www.google.com/url?sa=t&source=web&rct=j&url=https://blog.devolutions.net/2017/4/10-steps-to-secure-open-ssh&ved=2ahUKEwj65LbsyerrAhWk7XMBHcRND4cQFjABegQIDhAG&usg=AOvVaw0lePc6oitrt6DgzxRNwhcT

This article might help you

Answer 2

Strong Usernames and Passwords

Configure Idle Timeout Interval

Disable Empty Passwords

Limit Users' SSH Access

Disable Root Logins

Only Use SSH Protocol 2.

Use Another Port

Allow Only Specific Clients

Source : https://blog.devolutions.net/2017/4/10-steps-to-secure-open-ssh