What else is required to access node app outside of the DigitalOcean droplet?

Originally posted on SO

We have set up a node server which runs on PORT 5000.

In a newly created droplet, we have installed and started nginx. To access the node app, we have changed the default port from 80 to 5000 in /etc/nginx/sites-enabled/default

server {
        listen 5000 default_server;
        listen [::]:5000 default_server;

ufw is enabled

sudo ufw enable

Also the port is enabled

sudo ufw allow 5000/tcp

Also, tried this way too:

sudo ufw allow 5000

As confirmed with sudo ufw status

Also the app is configured to listen on the public interface

const server = app.listen(process.env.PORT || 5000, '0.0.0.0', () => {
    console.log('Express server listening on port %d in %s mode', server.address().port, app.settings.env);
});

However, not even the default PORT was responding. HENCE, reverted to 80 as the default PORT.

What else is required to access node app outside of the droplet?