Hi @Umeed
As the due date has passed for ITR U, AY 2020-21, you would not be able to file your ITR.
For the penalty which you have paid of ₹10k, you can connect to your regional AO (assessing officer) and request to change it to another assessment year to adjust the amount of penalty.
In case you have not filed ITR for AY 2021-22, the window is still open to file ITR U, till 31st March 2024.