Using a .htacess file in root of your public_html directory, you can deny access to wp-login.php by showing forbidden message. You can only allow specific IP or IPs or IP range to use wp-login.php

Just add below codes in .htaccess file of in root of your public_html folder.

<Files wp-login.php>
Order deny,allow
Deny from All
Allow from xx.xx.xx.xx
</Files>

Note: In above code change xx.xx.xx.xx to your IP.
Done!!

Warning