WP DEFENDER Login Lockouts - Brute force attack

we have been receiving more than 120 notifications of loggin lockouts from Defender, coming from multiple IPs trying to connect with a username close to the one of our admin account.

We activated the automatic banning of IPs for the moment, and wanted to know what would be your recommended action to avoid this brute force attack, currently happening on our site (7.10PM - GMT+1)