update | after I checked the error log, it shows
2024/03/21 15:17:32 [error] 45737#0: *2850317 FastCGI sent in stderr: "PHP message: PHP Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 147456 bytes) in /www/wwwroot/webinvite.id/wp-includes/class-wpdb.php on line 2320" while reading response header from upstream, client: 118.96.12.162, server: webinvite.id, request: "POST /wp-admin/admin-ajax.php HTTP/2.0", upstream: "fastcgi://unix:/tmp/php-cgi-80.sock:", host: "webinvite.id", referrer: "https://webinvite.id/wp-admin/post.php?post=887687&action=elementor"
2024/03/21 15:35:46 [error] 45737#0: *2850317 FastCGI sent in stderr: "PHP message: PHP Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 147456 bytes) in /www/wwwroot/webinvite.id/wp-includes/class-wpdb.php on line 2320" while reading response header from upstream, client: 118.96.12.162, server: webinvite.id, request: "POST /wp-admin/admin-ajax.php HTTP/2.0", upstream: "fastcgi://unix:/tmp/php-cgi-80.sock:", host: "webinvite.id", referrer: "https://webinvite.id/wp-admin/post.php?post=887687&action=elementor"