I want to send an email to users whose membership has expired 30 days after, one one email each, the data is in usermeta

					<?php

<?php

namespace WPTurbo;

function wpturbo_send_expiration_emails() {
    global $wpdb;

    // Define the number of days for expiration
    $expiration_days = 30;
    $expiration_date = date( 'Y-m-d H:i:s', strtotime( "-{$expiration_days} days" ) );

    // Get users whose membership has expired 30 days ago
    $users = $wpdb->get_results(
        $wpdb->prepare(
            "SELECT user_id FROM {$wpdb->usermeta} 
             WHERE meta_key = %s 
             AND meta_value < %s",
            'membership_expiration_date',
            $expiration_date
        )
    );

    // Get the admin email
    $admin_email = get_option( 'admin_email' );

    // Loop through each user and send email
    foreach ( $users as $user ) {
        $user_data = get_userdata( $user->user_id );

        if ( $user_data ) {
            $to = $user_data->user_email;

            if ( is_email( $to ) ) {
                $display_name = esc_html( $user_data->display_name );
                $subject = "Your Membership Has Expired";
                $message = "Dear {$display_name},nnYour membership expired 30 days ago. Please consider renewing your membership.nnThank you!";
                
                // Set up headers for BCC
                $headers = [];
                $headers[] = 'Bcc: ' . $admin_email;

                wp_mail( $to, $subject, $message, $headers );
            }
        }
    }
}

// Hook the function to a custom action or cron job
add_action( 'wpturbo_send_expiration_emails_hook', 'wpturbo_send_expiration_emails' );

// Schedule the event to run daily
if ( ! wp_next_scheduled( 'wpturbo_send_expiration_emails_hook' ) ) {
    wp_schedule_event( time(), 'daily', 'wpturbo_send_expiration_emails_hook' );
}