Audit them, then revive, repurpose, or retire each one deliberately. Keep the handle in nearly every case, because releasing it invites impersonation and squatting, and reclaiming a handle is difficult.
For accounts you are abandoning, update the bio and profile image to current branding, pin a post pointing to where you are active, remove any support or response promises you will not keep, and stop posting. Delete outright only for duplicate accounts, accounts under a retired brand name with no remaining equity, or accounts you cannot regain access to and cannot clean up.
An abandoned page with three-year-old posts and a stack of unanswered messages costs more credibility than most teams assume, because prospects read it as a signal about how you handle everything else.
