Eh, those attempts are just noise anyway. Use proper pubkey auth instead of normal passwords and you'll be fine. Any key size is probably enough to prevent successful bruteforce attacks. Anything above 2048 and there's basically no chance for them to guess right within several years of constant trying. Most bots move along quickly as well, they try their predefined list of (common usernames) x (common passwords) and that's it.

Install endlessh, an ssh tar pit, if you want to make their lives a little more annoying. Use a non-standard port if your OCD can't stand the slowly filling auth attempt logs.

If I'm bruteforcing a server and each time that I try an username/password my IP gets banned but suddenly one combination allows me to do 4-5 test ( any bigger number than previously) you are potentially telling me that this user is different (it exists) than the previous ones. Therefore you are doing the attack easier for me because now I know which users actually exist in the machine. It doesn't matter if you are locking the attacker after the password was given.

As others told you, using public key auth, non standard ports or even port knocking will be much more useful.