Seeing Nginx default site instead of my hello world app

Followed this tutorial to run a nodejs app on a droplet

https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-16-04

running pm2 and can see from the logs that the app.js is running

used curl for localhost:3000 and got the response hello world so pm2 is properly running a node server pointed at that localhost port.

Where I’m confused is basically the configuration. I’m assuming nginx is my server software similar to apache. pm2 is letting node run a local server in the background and nginx is then serving as a proxy that directs external traffic through the firewall to my local files (it would be cool if someone could drop a good primer on how this actually works.) And nginx I assume is somehow not getting the right variables from me about both where my files are stored (default locations) and also what url strings to redirect ( waveballoon.com vs waveballoon.com/index )

my nginx default file looks like this. I have not touched the other nginx.conf file

my node app is in /srv/www/hello/app.js

        root /var/www/html;

        # Add index.php to the list if you are using PHP
        index index.html index.htm index.nginx-debian.html;
    server_name waveballoon.com; # managed by Certbot


        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 4>
                try_files $uri $uri/ =404;
        }

        # pass PHP scripts to FastCGI server
        #
        #location ~ \.php$ {
        #       include snippets/fastcgi-php.conf;
        #
        #       # With php-fpm (or other unix sockets):
        #       fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        #       # With php-cgi (or other tcp sockets):
        #       fastcgi_pass 127.0.0.1:9000;
        #}

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


    listen [::]:443 ssl; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/www.waveballoon.com/fu>
    ssl_certificate_key /etc/letsencrypt/live/www.waveballoon.co>
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed b>
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by >

}
server {
 
        # SSL configuration
        #
        # listen 443 ssl default_server;
        # listen [::]:443 ssl default_server;
        #
        # Note: You should disable gzip for SSL traffic.
        # See: https://bugs.debian.org/773332
        #
        # Read up on ssl_ciphers to ensure a secure configuratio>
        # See: https://bugs.debian.org/765782
        #
        # Self signed certs generated by the ssl-cert package
        # Don't use them in a production server!
        #
        # include snippets/snakeoil.conf;

        root /var/www/html;

        # Add index.php to the list if you are using PHP
        index index.html index.htm index.nginx-debian.html;
    server_name www.waveballoon.com; # managed by Certbot


        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 4>
                try_files $uri $uri/ =404;
        }

        # pass PHP scripts to FastCGI server
        #
        #location ~ \.php$ {
        #       include snippets/fastcgi-php.conf;
        #
        #       # With php-fpm (or other unix sockets):
        #       fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        #       # With php-cgi (or other tcp sockets):
        #       fastcgi_pass 127.0.0.1:9000;
        #}
        # deny access to .htaccess files, if Apache's document r>
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #       deny all;
        #}


    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/www.waveballoon.com/fu>
    ssl_certificate_key /etc/letsencrypt/live/www.waveballoon.co>
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed b>
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by >


}
server {
    if ($host = www.waveballoon.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot
        listen 80 ;
        listen [::]:80 ;
    server_name www.waveballoon.com;
    return 404; # managed by Certbot


}

server {

        # SSL configuration
        #
        # listen 443 ssl default_server;
        # listen [::]:443 ssl default_server;
        #
        # Note: You should disable gzip for SSL traffic.
        # See: https://bugs.debian.org/773332
        #
        # Read up on ssl_ciphers to ensure a secure configuratio>
        # See: https://bugs.debian.org/765782
        #
        # Self signed certs generated by the ssl-cert package
        # Don't use them in a production server!
        #
        # include snippets/snakeoil.conf;

        root /var/www/html;

        # Add index.php to the list if you are using PHP
        index index.html index.htm index.nginx-debian.html;
    server_name waveballoon.com; # managed by Certbot


        location / {
                # First attempt to serve request as file, then
                # as directory, then fall back to displaying a 4>
                try_files $uri $uri/ =404;
        }
        # pass PHP scripts to FastCGI server
        #
        #location ~ \.php$ {
        #       include snippets/fastcgi-php.conf;
        #
        #       # With php-fpm (or other unix sockets):
        #       fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        #       # With php-cgi (or other tcp sockets):
        #       fastcgi_pass 127.0.0.1:9000;
        #}

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

    listen [::]:443 ssl; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/www.waveballoon.com/fu>
    ssl_certificate_key /etc/letsencrypt/live/www.waveballoon.co>
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed b>
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by >

}
server {
    if ($host = waveballoon.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


        listen 80 ;
        listen [::]:80 ;
    server_name waveballoon.com;
    return 404; # managed by Certbot