interstate supply of service registration requirements

Nik'$ (C.A & M.B.A) (24 Points)

09 October 2017  
considering changes made by GST council in 22nd meeting held on 06-10-17.
A service provider providing interstate services whoes turnover is below 20L. But he is registered under GST from july-17.
When should he surrender his registration?
Till what period he is requier to file GST Returns?