django.db.migrations.exceptions.InconsistentMigrationHistory

Since you are using a custom User model, you can do 4 steps:

1. Comment out django.contrib.admin in your INSTALLED_APPS settings

INSTALLED_APPS = [
   ...
   #'django.contrib.admin',
   ...
]

2. Comment out admin path in urls.py

urlpatterns = [
   ...
   #path('admin/', admin.site.urls) 
   ...
]

3. Then run

 python manage.py migrate

4. When done, uncomment all back