When a resident Indian gains non-resident Indian status, it is mandatory by the law to change the residential status in the bank accounts. FEMA rules for NRIs do not allow holding a savings bank account in India.
From FY 2020-21, you can choose to pay income tax under an optional new tax regime. The new tax regime is available for individuals and HUFs. “Lower tax rates but no deductions/exemptions” is the key feature