Hello cadance131,
Thanks for asking the Apple Support Communities about Contacts. Since you tried the basics, this means one of two things.
- You are out if iCloud storage: Manage your iCloud storage - Apple Support
2 . More likely though, you are using multiple contacts accounts, either on your other iOS devices, or your Mac. So you need to check this entire article, for all device types: If your iCloud Contacts, Calendars, or Reminders won't sync - Apple Support
"If your contacts, calendars, and reminders are in iCloud, then iCloud automatically updates your information. If your information is in a third-party account, like Google or Yahoo, you can change your default account to iCloud. Changing your default account to iCloud won't move your existing information from a third-party service to iCloud."
3 . If you are using multiple accounts, you will need to export them from that platform, such as Gmail, using a vCard, then import them using these steps: Import or export a vCard in Contacts on iCloud.com - Apple Support
Thanks.