If you mean you normally don't file a return, file a 2020 return and claim 1 dollar "Other Income" (found under Wages & Income") in order to file a return now for tax year 2020.
If you mean that you filed and said that someone else can claim you for tax year 2020, but that is not the case and you need to correct that, you will need to file an amended return and claim yourself.
You have 3 years from the date you filed your return (or 2 years after you paid the tax due, whichever is later) to file an amended return.
Please click here for how to amend a return you already filed
@raymareno65
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