You are required to obtain GST registration if the aggregate turnover from supply of services exceeds Rs. 20 lacs in a financial year
Apply for GST registration and start filing the returns
Export of services is treated as zero-rated. For export without payment of tax, all conditions for export should have been fulfilled alongwith the application of LUT. LUT is applied in advance for each financial year.
If you have fulfilled all the conditions for export of services then for previous year non-compliance you can contest on the basis of facts
For detailed discussion you may opt for phone consultation