nginx configuration for wordpress in the subdirectory

I run my wordpress application on a local server, I write my content in this sandboxed server and then convert my website into html files and server it from s3 bucket as a static site. I helps me keep my server costs low and also keeps my website secure from unwanted attacks. I have multiple sites hosted within single nginx server and they are hosted a subdirectories. The below configuration helps me achieve that

server {
	listen 80 default_server;
	listen [::]:80 default_server;

	root /var/www/;
	index index.php;

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

	location = /robots.txt {
			allow all;
			log_not_found off;
			access_log off;
	}

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

	location ~ \.php$ {
		include fastcgi_params;
		fastcgi_intercept_errors on;
		fastcgi_pass unix:/run/php/php-fpm.sock;
		fastcgi_param  SCRIPT_FILENAME $document_root$fastcgi_script_name;
	}

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

	location /muthu {
			try_files $uri $uri/ /muthu/index.php?$args;
	}

	location ~ \.php$ {
			fastcgi_split_path_info ^(/muthu)(/.*)$;
	}

}

My website folder is present in the /var/www/ directory