I'm assuming the file that's erroring is being included by something located in /home/sgn/public_html/careers4you/public_html ? If so, try adding this to the .htaccess in that folder:
<IfModule mime_module>
AddHandler application/x-httpd-ea-php71 .php .php7 .phtml
</IfModule>
Also, keep in mind that the PHP version used is based on the configuration for the script the user visits in their browser (i.e. you can't use a different version just for the includes). Includes can't have their own separate version of PHP, but rather an included file always inherits the PHP version of its includer.