cancellation of gst registration

Application for Revocation
Application in FORM GST REG-21 needs to be filed by the registered person, for revocation of GST registration, either directly or through a facilitation centre notified by the Commissioner.

Online Revocation Procedure
Following are the steps which a registered person needs to be followed, who wants to apply for revocation online through the GST Portal:

Access the GST Portal at www.gst.gov.in.
In order to enter into the account, enter the username and appropriate password.
In the GST Dashboard, select services, under services select registration and further under registration select application for revocation of cancelled registration option.
Select the option of applying for revocation of cancelled registration. In the select box, enter the reason for revocation of GST registration cancellation. Further, you need to choose appropriate file to be attached for any supporting documents and you need to select verification checkbox and select name of authorized signatory and fill up the place filed box.
The final step would be to select SUBMIT WITH DSC OR SUBMIT WITH EVC box.

follow the link

https://www.indiafilings.com/learn/revocation-of-gst-registration-cancellation/

I want to cancel Gst registration and my transaction is nill. so what interest and penalty will I have to pay