Investors & landlords

Hello, 

My situation is a little different and I want to make sure I do it right.

We sold our primary residence in November of 2020 and moved to the house which we were renting until then.  Somehow we didn't convert that rental property to primary residence on our 2020 tax return (only realized that just now, when working on our 2021 tax return).  First I was thinking about filing an amended return for 2020 in order to correct my mistake and "convert rental to primary residence", but then I tried to take care of that on my 2021 tax return by selecting "No, this property was not rented all 2021 year", then putting 0 zero into Days rented and 364 in Personal use during 2021 year.  I also checked the "I did not rent. attempt to rent, this property at all in 2021" check box.  And saw the warning that property will be deleted.  My question is this: should I delete that rental and keep all forms from my 2020 and 2021 tax returns and use them later when I decide to sell that property (let's imagine in 2 years to avoid paying taxes) or should I file amended tax return for 2020 year to properly "convert it to primary residence"?  Thank you