Couldn’t sync iCloud data

I got a new phone but the guy at the Apple Store took my phone for trade-in without activating my new one. So now I’m having SO many issues getting my new one set up. One is that I can’t sync my end-to-end encrypted data. So like all my saved passwords.. which I need. Also all my previous iMessages saved in my iCloud data. The pop up says this and I’m afraid to click”delete iCloud data” because I don’t know what it will delete. What will it delete and is there a way to get around this?

Couldn't Sync iCloud Data

To continue using iCloud to sync your end-to-end encrypted data, you'll need to delete current data stored in iCloud

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Delete iCloud Data