If you reported a Capital Loss of 50K in 2020, you are correct that you are allowed a carryover loss deduction of $3,000 each year against your other income, until your entire loss is used up.
However, if you were entitled to an Ordinary Loss instead, as mentioned above, you can Amend your 2020 return to correct this.
Ordinary Loss is the loss realized by a business owner operating a business that fails to make a profit because expenses exceed revenues.
If you amend your return, type 'Schedule C' in the Search area, then click on 'Jump to schedule c'.
Enter your business income/expenses as you normally would to determine the amount of your business loss. You will be able to indicate that your business was closed and take your loss against your other income for the year.
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