Hi
The tax benefits can only be claimed till you have a RNOR status. Once you become a Ordinary resident, global income shall be taxable in India.
For RNOR status, any of the following 2 conditions have to be satisfied:
1. NRI in 9 out of 10 previous FY - this won't be satisfied from FY 20-21 onwards.
OR
2. Stay in India in previous 7 FYs (FY 13-14 to FY 19-20) for a period of 729 days or less.
Check for the second condition in your case for eligibility of RNOR status.