Sneaky default contacts set-up with Microsoft Outlook
I have 3 emails synced to my iPhone's Mail app: iCloud, Gmail, & Outlook. All 3 have contacts enabled, but Outlook was set to the "default account" for contact saving without me noticing. This must have happened by default when I first added this email account to my Mail app. Now contacts that I have been adding to my phone are going to my school Outlook account, which will be disabled once I graduate.
How can I get these contacts off of Outlook and into iCloud?
Why does Outlook change my default contacts account without notifying me? Can this be changed so future confused users like me will not wonder why all their contacts are suddenly storing in Outlook instead of iCloud?
iPhone 6s, iOS 11.2.1