Filing Annual Return and closing Bank account after GST cancellation

Hi,

I cancelled my GST in Mid 2021, and I have filed all GSTR1, 3B returns and final return upto date of cancellation except the GSTR 9 Annual returns.

I have no transactions (nil) for FY2020-21 and FY2021-22. GSTR 9 has been made optional for FY 2020-21 I think for under 2 crore. 

Can I close my bank current account linked with GST now or should I wait until next year to file GSTR 9 for FY 2021-22 and then close it? If I close my bank current account and if in worst case I get some late fees, is there way to pay it?

Thanks