There is no trash bin sort of functionality to restore a space, and if you are on Confluence Cloud it is impossible to retrieve it.
If you are using Confluence server (self-hosted) you can install a temporary Confluence instance of the same version and restore an old backup from before the space was deleted. (By default, there are full site back-ups in the <Confluence_Home>/backups directory.)
After restoring the site back-up to the temporary instance you can do an XML export of just that space, then restore it to the original instance where it was deleted.
If you are using self hosted Confluence and want to try that strategy, please let me know any questions about the procedure.
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