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What are you referring to when you say basic brute force protection?
fail2ban mainly, but also things like scaling login delays (some sort of option often built into the software you're running, but just as often not configured by default), or if you're feeling particularly paranoid account locking after too many failures, and in general just not using default, predictable, common usernames or weak passwords, and honestly it's even helped a bit by having slow hardware and throttled network bandwidth.
The goal is to make it so that someone can't run a script that sends 100 million login attempts per second for common or stolen usernames and passwords and your server just helpfully tries them all and obediently tells them none of those worked... until one of them does.
Not only does this encourage them to TRY sending 100 million login attempts per second because your server isn't refusing it, which is a huge waste of bandwidth and resources, it also makes it really likely that they're eventually going to guess one right.
The other answer is already good but I answer more general.
Rate limiting. Do not allow as many requests as your CPU can handle but limit authentication requests. Like a couple requests per second already goes a long way.