How do I point my custom domain to my IP:Port using reverse proxy at nginx

I have a wordpress website pointed to my droplet ip (143.198.196.140) and i want to point it with port. I have been reading some tutorials at the community but i am still lost on how to set up the droplet ip:port using the reverse proxy.

The setting of my reverse proxy right now is :

server {
        listen 80 default_server;
        server_name _;
        return 301 https://$host$request_uri;
}

server {
        #listen 80 default_server;
        #listen [::]:80 default_server ipv6only-on;

        listen 443 ssl;
        listen [::]:443 ssl default_server;

        #ssl    on;
        ssl_certificate /etc/nginx/certificate.crt;
        ssl_certificate_key     /etc/nginx/private.key;

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

        # Make site accessible from http://localhost/
        server_name localhost;

        proxy_set_header        X-Real-IP       $remote_addr;
        proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;

        location / {

                proxy_pass https://langkahhoki.com;
                proxy_ssl_server_name on;
	 }

        error_page 404 /404.html;
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }

        location ~ \.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/run/php/php8.0-fpm.sock;
        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #       deny all;
        #}
}