Can access through IP but can't with domain

I am using a Docker droplet and I am trying to configure Nginx as a reverse proxy. When I type my IP in the browser I can see the HTML my page, but when I use my domain (mydomain.com) it doesn’t work. I notice that with Postman I can make a GET request HTTP and it loads the HTML page, on browser always try to use an HTTPS connection.

Here is my nginx.conf:

server {
    listen 80;
    listen [::]:80;
    listen 443;
    listen [::]:443;

    server_name iamgonzales.dev www.iamgonzales.dev;

    location ~ /.well-known/acme-challenge {
        allow all;
        root /usr/share/nginx/html;
    }

    root /usr/share/nginx/html;
    index index.html;
}

Here is my docker-compose.yml

version: '3.1'

services:

  letsencrypt-nginx-container:
    container_name: 'letsencrypt-nginx-container'
    image: nginx:latest
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx.conf:/etc/nginx/conf.d/default.conf
      - ./letsencrypt-site:/usr/share/nginx/html
    networks:
      - docker-network

networks:
  docker-network:
    driver: bridge

Here are all my droplet open doors:

root@docker:~# netstat -tulpn | grep LISTEN
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      740/systemd-resolve
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      951/sshd
tcp6       0      0 :::80                   :::*                    LISTEN      5412/docker-proxy
tcp6       0      0 :::22                   :::*                    LISTEN      951/sshd
tcp6       0      0 :::443                  :::*                    LISTEN      5400/docker-proxy

Is there any conf that I missing??

Appreciate any help as I lost half day on this.