GST Suo Moto Cancelled

He can file directly all pending Returns, and than after apply for revocation...
File all Returns as earlier as possible, as if you filed returns on or before 30th September, 2020 than late fee is capped to Rs. 500 per month per return and No late fee for NIL return.
After 30th September, 2020 late fee as per normal rule applicable.

Yes because of the scheme only he is filing the returns thanks sir for prompt revert...

You can file the returns prior to the period in which it is cancelled by sue motto. After filing that you have to apply for revocation then only you can file for the rest of the period till to date.