I've no idea who stopped the FRS service for more than 1 year
You can try but it sounds like a tombstoned situation in which that one will need to be rebuilt from scratch. Seize roles (if necessary)
https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/transfer-or-seize-fsmo-roles-in-ad-ds
then do cleanup prior to rebuild.
https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/ad-ds-metadata-cleanup
https://techcommunity.microsoft.com/t5/itops-talk-blog/step-by-step-manually-removing-a-domain-controller-server/ba-p/280564
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