Should GSTR9 be filed for nil turnover?

Hi,

I had cancelled my GST Registration in June 2021 and filed final GSTR10 return.

So I think, I have to further file Annual returns for FY2020-21 and FY2021-22.

For FY2020-21 I have zero (nil) turnover. My taxpayer type is "Regular" (not composition scheme).

Am I required to file the GSTR9 and GSTR9c for FY2020-21?

Thanks in advance for your help.