My website - karimsranchi.com to showing 500 error. And issue function.php file rename can you please resolve immediate, Please let me know if any need.
Seems from my end, your Website is working. Can you confirm it’s resolved? 
Yes, its working but for one question- how to access ftp for this website through Filezilla? Because i can’t access
Cloudflare will not proxy FTP traffic. The hostname you use to connect needs to be 
. If you connect using a host name like ftp.example.net you can change this on the DNS page of your Cloudflare dashboard. If you use the same hostname as your website, then you can either create a dedicated FTP hostname that is , or connect using just the origin IP in FileZilla.
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