Gst registration (less then 20 lac annual turnover)

Hello,

After recent change in GST registration for e-commerce business with annual turnover less then 20 lac do not need to register for GST.

My query is If any business has already registered for GST but has not reached to the thershold  of 20 lac. What should he do?

Should he discontinue the filing or close / cancel the GST registration.

Thanks