If you've been making your home in India for over 10 years, and you no longer maintain a home in California, and your visits to California are temporary or transient, then for tax purposes you are a non-resident of California.
California taxes non-residents only on California-source income. If you take a job as an independent contractor (as opposed to as a W-2 employee), then any income you earn by providing services to California-based clients is considered California-source income, and is taxable by California.
California Publication 1031 has extensive information on how to determine your tax residency. Here's a link:
https://www.ftb.ca.gov/forms/2022/2022-1031-publication.pdf
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
