Code 766 means that you have a credit on your account, which might be the result of a refund, an overpayment from a previous year, or a credit from the current year's return. Your transcript shows an amended return was filed on 05/21/2021.
The IRS allows only 3 years for you to file a return if you are due a refund for withholding or estimated taxes. This same rule applies to a right to claim tax credits such as Earned Income Credits. Therefore, it you did not file a return for 2017 it is too late to file any refund.
You can call the IRS at 1800-829-1040 to discuss your transcript. They are open 7AM - 7PM. See additional information in the link below:
Filing Past Due Tax Returns
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