Nginx always give me 504 error on wordpress

I got nginx 504 Gateway Time-out when trying to install plugin from wordpress dashboard.

this is the error I got from log.

2020/12/22 21:12:35 [error] 7695#0: *2188 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 116.199.102.12, server: _, request: “POST /wp-admin/admin-ajax.php HTTP/1.1”, upstream: “fastcgi://unix:/run/php-fpm/www.sock”, host: “68.183.225.249”, referrer: “http://68.183.225.249/wp-admin/plugin-install.php?s=TablePress&tab=search&type=term”

I had trie some advice from the community by trying to incrase the execution time but not luck below is my config:

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  _;
        #root         /usr/share/nginx/html;
        root /var/www/html/wordpress;

        # Load configuration files for the default server block.
        include /etc/nginx/default.d/*.conf;

        charset utf-8;
        gzip on;
        gzip_types text/css application/javascript text/javascript application/x-javascript  image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon;

        location = /favicon.ico {
                log_not_found off; access_log off;
        }


        location = /robots.txt {

                log_not_found off; access_log off; allow all;
        }

        location ~* \.(css|gif|ico|jpeg|jpg|js|png)$ {
                expires max;
                log_not_found off;
        }


        location / {
                try_files $uri $uri/ /index.php?$args;
                proxy_read_timeout 240s;
        }

        location ~ \.php$ {
            fastcgi_pass unix:/run/php-fpm/www.sock;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
                fastcgi_read_timeout 300;
                fastcgi_connect_timeout 300s;
                fastcgi_send_timeout 300s;
        }
 }

I had added inside the nginx configure file.

                fastcgi_read_timeout 300;
                fastcgi_connect_timeout 300s;
                fastcgi_send_timeout 300s;```

from php.ini change to
```max_execution_time = 300 ```

inside /etc/php-fpm.d/www.conf
changed to ```request_terminate_timeout = 300```

thanks advance if any of you can help me.