Unable to access admin panel

Try manually resetting your plugins (no Dashboard access required). If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel, navigate to /wp-content/themes/ and rename the directory of your currently active theme. This will force the default theme to activate and hopefully rule-out a theme-specific issue (theme functions can interfere like plugins).

Also try reviewing https://www.ads-software.com/support/article/login-trouble/

check web server logs for error
look like hacked site
try ro restore site from backup,
or compare site files with backup copy

I located a troubleshooting article from HostGator and was able to diagnose and resolve the issue. There was a security plugin blocking access to the login page.

Thanks, everyone, for your prompt help — much appreciated! ??

Glad its sorted ??