Two easy steps

1. Just add a new config with the full “server {}” block in /etc/nginx/sites-available/
   For example, /etc/nginx/sites-available/gene.jinabs.com.conf

   server {
     listen 443;
     listen [::]:443;
   
       root /var/www/gene.jinabs.com/html;
       index index.html index.htm index.nginx-debian.html;
   
       server_name gene.jinabs.com www.gene.jinabs.com;
   
       location / {
       try_files $uri $uri/ =404;
       }
   }

2. Create symbol link for gene.jinabs.com and restart/reload Nginx as follows.

   ln -s /etc/nginx/sites-available/gene.jinabs.com.conf /etc/nginx/sites-enabled/
   nginx -t
   systemctl restart nginx

That’s it.