Kashmiris in Kashmir and around the world, need to get the world's attention. In foreign cities, massive peaceful demonstrations; even civil disobedience to get the world's attention. India has to be shammed in front of the world, especially the US.
Civil disobedience in England, with a large Kashmiri population, against Indian government or Tourism office may get enough media attention.
Massive Sit Ins obstructing normal business.
https://www.ncpedia.org/sites/default/files/images/enc/IC-21.png
https://www.crmvet.org/info/sitins.pdf
Here is one example of a Massive protest in the UK, but with Sit ins, they have to obstruct business as usual.
https://www.theguardian.com/environ...ed-in-london-for-extinction-rebellion-protest
The Kashmiris need to use the laws of India against it. Just as Gandhi showed the hypocrisy of the British Empire, so to must the Kashmiri inside and outside Kashmir need to show the hypocrisy of "Democratic" India.
Kashmirs can agitate the Gulf Arabs and Nigerians to embargo India of their oil, in a manner similar to the 1973 oil embargo.
@Khafee how would this go over in Saudia? Nigeria plus the Arabs make up over half of India;s oil, and they are already in a weakened position because they can't get Iranian oil, so have to import more Gulf Arab oil; hence the Arab have more leverage here.
Another avenue of protest is getting African countries that trade with India aware of the human rights violations India is committing in Kashmir. Starting in South Africa, which is living with the memory of apartheid, the Kashmiris, or Desi community in general, there can go to the media and expose Indian violations against a democratically elected representative put under house arrest to suppress the will of the Kashmiri people. This news and activists spreading this news can travel around Africa, and let media and other democratic people's groups know, especially in countries doing a lot of trade with India. This can also be done in Europe. Especially in countries of Eastern Europe that lived under Soviet rule. Poland can be reminded of the Solidarity movement, and other eastern European allies can be found piece by piece, forming an international coalition to sanction India. Even a few percent loss to the India economy will be felt, and world condemnation will hurt India's soft power image, putting pressure on Modi to reverse course.
http://www.worldstopexports.com/indias-top-import-partners/
This should get Regional and International friends of both Pakistan and India, such as the Arabs and the Americans to pressure the two nations to resolve the Kashmir dispute.
-------------
India knows that the people of Kashmir, either want Independence or Annexation with Pakistan, but very few would want to stay with India. Hence this move to forcefully assimilate Kashmir.