How to clean my iPhone 7 storage and put everything on iCloud
How do I free up my storage and put everything on my iCloud
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You can't do what you want to do with iCloud because iCloud is mostly syncing storage. However, iOS optimization will get you partway and maybe far enough for you to be able to use your device without being connected to the Internet 24/7/365 and constantly manually managing items.
Click on the link to learn how to optimize the storage on a device --> "How to check the storage on your iPhone, iPad, and iPod touch" - https://support.apple.com/HT201656