as django’s doc says, the value of DATA_UPLOAD_MAX_NUMBER_FIELDS is default 1000, so once your form contains more fields than that number you will get the TooManyFields error.
check out here: https://docs.djangoproject.com/en/stable/ref/settings/
so the solution is simple I think, if DATA_UPLOAD_MAX_NUMBER_FIELDS exists if your settings.py, change it’s value to a higher one, or, if it doesn’t, add it to settings.py:
DATA_UPLOAD_MAX_NUMBER_FIELDS = 10240 # higher than the count of fields