Hello,
Do you have a backup? Some hosting providers make regular backups.
Try to update the theme and Core plugin.
Your hosting data can’t be used to connect ftp, so we need FTP access ( FTP host, FTP username, FTP password, FTP port. If you do not know how to create FTP contact with your hosting provider, they will help you).
Our technicians team will back to work tomorrow morning.
Regards