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a metadata backbone with a plug-in system that allows Nextcloud core and all the apps to manage different kinds of metadata (like EXIF, MP3 tags, bibliographic data, medical imaging, …) allowing searches, dashboard widgets, time trends and more
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real tags management: search tags in unified search, have widgets that display last tags / most used tags / tags trends / …, interaction with projects, share by tags, …
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Extend Flow functionality by allowing “federation” (i.e.: Flow procedures can act on more than one Nextcloud installation) and interfaces with the major opensource software like Node-RED or n8n (see IFTTT channels for Nextcloud )
I like also the ffully-integrated nextcloud backup solution proposed by @marcelklehr !