Unable to view website via subdomain

I have followed this official guide of setting up nginx and hosting a stating website. I replaced all instances of example.com with stuff.flashblaze.xyz.

My name servers are on Vercel (formerly Zeit). I have also created A record of stuff to point to my IP address and enabled reverse DNS on Linode with value of stuff.flashblaze.xyz which did not give any errors. After following the complete guide, I can view the website by going to my IP address, and
dig +short stuff.flashblaze.xyz
also gives the correct IP address.

However, on going to stuff.flashblaze.xyz it says Unable to connect. What am I doing wrong?

This is my stuff.flashblaze.xyz.conf file

server {
    listen         80;
    listen         [::]:80;
    server_name    stuff.flashblaze.xyz www.stuff.flashblaze.xyz;
    root           /var/www/stuff.flashblaze.xyz;
    index          index.html;
    access_log     /var/www/stuff.flashblaze.xyz/logs/access.log;

    gzip             on;
    gzip_comp_level  3;
    gzip_types       text/plain text/css application/javascript image/*;
}

Running sudo systemctl status nginx gives this output

● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2020-07-08 17:43:24 UTC; 10h ago
     Docs: man:nginx(8)
  Process: 20813 ExecStop=/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile /run/nginx.pid (code=exited, status=1/FAILURE)
  Process: 23523 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
  Process: 23513 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=0/SUCCESS)
 Main PID: 23526 (nginx)
    Tasks: 2 (limit: 1109)
   CGroup: /system.slice/nginx.service
           ├─23526 nginx: master process /usr/sbin/nginx -g daemon on; master_process on;
           └─31107 nginx: worker process

Jul 08 17:43:24 localhost systemd[1]: Starting A high performance web server and a reverse proxy server...
Jul 08 17:43:24 localhost systemd[1]: nginx.service: Failed to parse PID from file /run/nginx.pid: Invalid argument
Jul 08 17:43:24 localhost systemd[1]: Started A high performance web server and a reverse proxy server.