You can look up for:

• Setting up max authentication attemps per connection -> slows up a lot brute force attack, if your password is strong enough, that’s already a big step to secure your server.
• Generate SSH Keys and disable password authentication -> do this only if you’re connecting through the same devices, because you won’t be able to connect from any device that has not being set up.
• Set up Crowdsec -> it’s a service which scans logs and will block access to any suspicious IPs. It also relies on a crowdsourced list of I.P.s that are identified as threat and will preventively block them