How to protect Web Admin - maybe reCAPTCHA?

#1
I'm looking for ways to protect my web admin. I chose complicated password, changed default "admin" login and switched web admin port. Hovewer even though the chances are low, I'm still worried about bruteforce. I want to to know if there any other ways to protect web admin.
  • Allowing to connect only from certain IP - doesn't work for me, my IP is dynamic
  • reCAPTCHA - in the server settings I see only anti-DDoS reCAPTCHA. I don't really need it just yet. But I don't see a way to enable login page reCAPTCHA. Is it possible?
 
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