How to install a nginx-only domain in a server running Vesta (apache + nginx)?

Hi I have a Cloud Server in a local hosting company with Ubuntu Server 18.04 installed. I've already successfully installed Vesta Control Panel with these settings:

Web: nginx + apache
FTP: vsftpd
Mail: exim + dovecot + spamassasin + clamav
DNS: named
Firewall: iptables + fail2ban
Softaculous: Yes
DB: MySql + PostreSQL
I succesfully added three domains via Vesta CP user interface and configured them properly. I used this setup because these three sites use Wordpress, so installing wordpress solely with nginx is quite complicated, but using apache + nginx works pretty well.

Now I want to know if I can install another domain/site that does work only in nginx, because I then need to configure guinorn to run a Python/Django web app (ass opossed to the other 3 domains where I use wordpress).

I tried this steps: went to /etc/nginx/conf.d and added a mydomain.com.conf file with these settings:

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

root /var/www/gero.com.ar/public_html;

index index.html;

server_name gero.com.ar www.gero.com.ar;

access_log /var/log/nginx/gero.com.ar.access.log;
error_log /var/log/nginx/gero.com.ar.error.log;

location / {
try_files $uri $uri/ =404;
}
}


Then restarted both nginx and apache services, but it didn't work. When I enter gero.com.ar, it goes to the vesta default domain.

Is there a way to do this? Do you know any tutorials/guides that accomplish something different?

In case the text is unclear or my approach is not correct: What I want to accomplish one way or the other is to have 4 domains in my server. One running a django app and the other three running wordpress. I already did the wordpress part, trying to figure out the django part now.

Thanks in advance