You can file 2022 first, then go back and file 2020 and 2021 later. But it's possible, especially if your 2020 and 2021 situations were more complicated, that something in your 2020 or 2021 tax return will affect your 2022 tax return. So it's safer to do them in order. You can get an extension to October 16, 2023 to file your 2022 tax return. See "How do I file an extension?"
