Receiving 503 on Nginx after setting Cloudflare's Origin Certificate

I have a Django app running with Nginx + Gunicorn. Before, I had a Let’s Encrypt Certificate and Cloudflare SSL encryption mode as Full. After deleting the Let’s Encrypt Cert and modifying everything on my Nginx server I followed this tutorial. Now every request returns 503.

Nginx /sites-enabled/:

server {
    listen 80;
    listen [::]:80;
    server_name my-site.com www.my-site.com;
    return 302 https://$server_name$request_uri;
}

server {
    # SSL configuration

    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    ssl        on;
    ssl_certificate         /etc/ssl/cert.pem;
    ssl_certificate_key     /etc/ssl/key.pem;
    ssl_client_certificate  /etc/ssl/cloudflare.crt;
    ssl_verify_client on;


    server_name my-site.com www.my-site.com;

    location = /favicon.ico {
        access_log off;
        log_not_found off;
    }

    location /static/ {
        root /home/sammy/myproject/app;
    }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }
}

Every status shows that everything is running and active.