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It depends on when the Delta eCredit was generated.
eCredits generated during the pandemic (before 1/12/22) can be used during 2023 for flights that are to occur during 2024.
Delta eCredits created after 1/12/22 do not have the same grace attached to them.
There is really no way to “work the system” to extend them.
If you book a flight with them and then later cancel that flight, after the eCredit expiration date, the eCredits are lost.
Best advice is to just take a trip!