nginx stopped serving static folder for django app by using WSL - django

Question

I am using WSL to run nginx to serve django app on "d" partition, yesterday it worked just fine, today stopped working correctly.
this is my conf file:
upstream django {
# server unix:///path/to/your/mysite/mysite.sock; # for a file socket
server xxx.xxx.x.xxx:8000;
}
# configuration of the server
server {
# the port your site will be served on
listen 8000;
# the domain name it will serve for
server_name xxx.xxx.x.xxx; # substitute your machine's IP address or FQDN
charset utf-8;
# max upload size
client_max_body_size 75M; # adjust to taste
# Django static
location /static {
alias /mnt/d/backend/static; # your Django project's static files - amend as required
}
# Finally, send all non-media requests to the Django server.
location / {
uwsgi_pass django;
include /etc/nginx/uwsgi_params; # the uwsgi_params file you installed
}
}
server and domain name are the same as allowed host in settings.
STATIC_ROOT = os.path.join(BASE_DIR,"static")]
I am not sure if I am referring to the right path for the static files.
as they are in different location, I am little confused about using virtual environment, wsl at the same time.
(venv) root#DESKTOP-XXXXXX:/mnt/d/backend
the problem is that the server doesn't load the static files.