Hello,
Thank you for reaching out to us.
1/ Please enable debug mode in WordPress – https://wordpress.org/support/article/debugging-in-wordpress/ to find out what error appears on your site, it will point you in the right direction and what needs to be fixed.
2/ We kindly ask you to downgrade your PHP version to either 8.1 or 8.2 (contact your hosting provider) , as not all plugins are currently compatible with your current version.
3/ Additionally, please contact your hosting provider to request FTP access credentials. Once you have obtained them, kindly share the details with us so we can further assist you.
Warm Regards,
The 8Theme Team