If the “attack” is distributed, the only thing you can do is to change the url of the login endpoint. This should be easy to do with web server config (block /login and friends, map some other “slug” to wp-login.php). This will also break the automatic redirect from /wp-admin to /login which is a good thing in this case.
Don’t forget to handle xml-rpc as well in the same way.
Of course this answer is not great if you have many users, but it can work if the number of users is small.
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