I run the Django app with gunicorn and nginx on a virtual server. But it gives a 403 error for loading static files

I’m having difficulties making a minimal nginx+gunicorn+django static files work properly, here are further details:

I have a production Django server running on Debian 11, Nginx + Gunicorn that out of nowhere will only partially load one of the main css files for the site and then will timeout.

I’m running a Django app using Gunicorn and Django. It was running, but when I rebooted the instance, Django and Gunicorn does not auto start. I made adjustments (like below), now both are not running eventhough I have restarted the services.

I am a newbie to nginx and run into a problem: nginx response with 403 Forbidden when I request example.com/media/ and all files inside the media folder. I am creating web application with python using Django Rest Framework.