Gst on export of service

Hello, So according to the new rules, inter-state service providers are not liable to register if turnover<20lacs.

Questions:
1) Turnover of prev year or current year?

2) Export of service comes under inter-state, right?

3) Registered as voluntary as date of liability was not yet in sight.

No sales from June - date. Should cancel registration right? Turnover of this year is hopefully going to be 14lacs. Thanks