Conversions are recorded in the calendar year, so if your conversion took place in 2021, then you would report that on this year's taxes.
The recharacterization is reported in 2020, so amend your 2020 return.
Champ @macuser_22 has an excellent explanation in How to handle 1099-R with Distribution Code "R"? The example is for 2017 and 2018. Just change the dates to 2020 and 2021.
For help see How do I amend my 2020 return?
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
