(Image source from: Taxation of OCI holders living in India)

OCI holders who live in India and hold US passports should be aware that the US taxes its citizens on the basis of their nationality and not on the basis of which country they reside in. Even though you may have OCI (lifelong visa to stay in India) you are still an American citizen. As a US. citizen residing abroad, you still must file a US Income Tax Return each year on your worldwide income! Actually even if you have no income, you should be filling US tax returns every year as in the long run this may prove beneficial to you. Worldwide income of US citizens is subject to US. income tax, regardless of where you reside.

Living in India permanently -  Shall I file US income tax yearly?

Many foreign citizens settled in India have perhaps often thought about
their obligation to pay taxes to their home country. Most countries, when it
comes to income taxes from their citizens, expect them to pay their fair
share.

Perhaps the only way a US citizen living in India can stop filling US taxes is to give up US citizenship, acquire Indian citizenship. Remember OCI is not dual citizenship of India. In such a scenario your taxes due for previous years before you acquire Indian citizen are still due even if you did not file returns.