How can I change (relocate) a subversion url that I entered when creating a mirror repository using "svnsync init" (example from #https://whatever to svn://whatever)?

tried to run svnsync init again with new url but

svnsync init file:///<path_to_mirror> http:///<new_url>
svnsync: Destination repository is already synchronizing from 'http:///<old_url>'
svn svnsync
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