Wordpress：更改网址后500内部服务器错误

My domain (example.com) is pointed to public_html/cushbu it contains a wordpress project

so i've changed the settings in wp-config file

 define('WP_HOME','http://example.com');
  define('WP_SITEURL','http://example.com');

Also in .htaccess file thats under pubic_html/cushbu folder

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /example.com
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /example.com/index.php [L]
</IfModule>

# END WordPress


# Wordfence WAF

<Files ".user.ini">
<IfModule mod_authz_core.c>
    Require all denied
</IfModule>
<IfModule !mod_authz_core.c>
    Order deny,allow
    Deny from all
</IfModule>
</Files>

# END Wordfence WAF

#disable hotlinking of images with forbidden or custom image option
RewriteEngine on
RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?example.com [NC]
RewriteCond %{HTTP_REFERER} !^http(s)?://(www\.)?google.com [NC]
RewriteRule \.(jpg|jpeg|png|gif)$ – [NC,F,L] 

I got 500 error when accessing my domain (www.example.com)

Remove example.com in .htaccess from the RewriteBase and RewriteRule. It is probably easiest for you to rename the file to bck.htaccess and let wordpress generate a new one for you.