Iranians have a strong link to Zoroastrian customs. Nauroz and other festivals are celebrated even by conservative Muslims.
In Pakistan, we also observe Hindu customs, especially in our weddings and birthdays, but we like to deny that fact.
I have met people from Karachi (like myself), Lahore, Balochistan, Abbotabad, etc. but I don't know if any ethnic group dominates.
Migration to Australia has always been among the easiest in the world for technical people without lots of money for an investment visa. You can self-sponsor without a job offer if your skills are in the official in-demand list.
Yeah, they were Afghans.
The region of South Asia called India, not the country, used to be one of the richest on the planet in terms of GDP before the British Raj. Ancient empires used to conquer as far away as Cambodia and Indonesia. Going further back, the Indus Valley Civilization in present-day Pakistan and eastern India was on par with Mesopotamian and Egyptian civilizations.
So the region does have a history of past greatness but, as I mentioned, that is not a guarantee or entitlement of future greatness.