Can I rank in regional languages like Hindi or Tamil?

The answer

Yes. People search in many Indian languages and in mixed language, and you can publish original content in the language your audience prefers. Google recommends separate URLs for each language version, linked with hreflang annotations, and cautions against translating only the boilerplate while leaving the main content in another language. Study how people actually phrase queries, including English words inside local-language sentences, and test with a few pages first.