It is required that your administrator profile be listed as a member of an Experience Cloud site in order to manage it. If your profile is not selected in the site's Administration Members Setup (as documented in Add Members to Your Experience Cloud Site), the Manage and Workspaces actions are not available when viewing the site via Setup > All Sites.
You can use the Salesforce Data Loader to insert your profile into the site's member group using the NetworkMemberGroup object to regain access.
In Salesforce Classic
In Lightning Experience
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