Having your parent be elected prime minister of India or winning a Nobel Prize would also improve your chances.
However, as @TomSrOfBoston is essentially saying, Harvard receives a large number of applications from exceptionally well qualified applicants. Relative to the number that they accept, they probably get more great applications from India than anywhere else. Your application will be one of a very long list that survive the initial “are they at least qualified” screen. After that it is hard to say how they figure out who gets accepted.
You are clearly a great student and a great applicant. You are going to do well wherever you end up. Harvard is a super high reach.
Ignore the facetious comments above. You have some great accomplishments. What is unsaid is that getting into Harvard as an international is extremely competitive. I think I remember reading somewhere that Harvard has a total of 30 students from the Indian subcontinent in total. This is about 6-7 students per year. And probably a few of these are athletic recruits or legacy.
So you certainly have the stats. But you don’t have the special “Oooh-ahh” factor. You need to have something that will completely wow them. The needs for Harvard changes every year, so its impossible to predict what they want.
Instead focus on what you can control. Applying in the early rounds will be your best shot. And if you don’t need financial aid, that will make things easier. Just pick a solid ED1 and ED2 choice. You probably have a better chance at schools farther down the ranking list, especially ED1.