Reactivate an expired recurring membership
Change/edit/update an expired membership back to never expires
Head to Customers >> Customer List >> Select the desired customer >> Membership Tab, where we can now see all active and inactive memberships.
When you select the membership, you'll have an option to "Reactivate" it on the right.

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You'll be asked to set a new expiry date. Please ensure you select a date in the future, past the present date i.e. year 2025.
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The membership will be reactivated with a new expiry date, we'll hit "Edit" >> tick Never Expires.