Upload old contacts from other devices
How can I access my old contacts from other devices I had associated with my Apple ID?
iPhone 5s, iOS 12
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Were the devices set to sync your Contacts to iCloud? If yes, sign into the same Apple ID with iCloud on your new device.
Set up iCloud on your iPhone, iPad, or iPod touch - https://support.apple.com/HT208681
Get help using iCloud Contacts, Calendars, or Reminders - "Learn what to do if you need help. For example, the changes that you made on one device didn't appear on all of your devices."
Click here --> https://support.apple.com/HT203521