You can amend your tax return to request a refund from Maryland. See How do I amend my state tax return? - TurboTax Support - Intuit
For 2022, if you were a Maryland resident, you will have to file Part-Year Maryland return for the time you were a Maryland resident. If you are going to a change to DC reporting of the income under the reciprocity agreement, you will have to amend the DC returns as well. If you claimed the credit for taxes paid to a nonresident state on the Dc returns, you will have to correct that as well. You also said you filed as a nonresident of Maryland for 2022 and 2023- so you would not change your resident status, just the income reported.
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