Restore from iCloud Backup

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1). Restore from iCloud Backup
2). Restore from iTunes Backup
3). Recover through iPhone data recovery tool
4). Restore through changing iPhone Settings.

i hope, it will help you
stellarinfo.com/blog/restore-missing-deleted-iphone-contacts

You may need to turn to a professional data recovery program for iPhone devices - MobiKin Doctor for iOS (Windows) or MobiKin Doctor for iOS (Mac OS X). It could be the best iPhone Contacts Recovery program for Windows or Mac users, and can help all users rescue the deleted, lost or formatted contacts from all generations of iPhone without any limitation

Here is a good video guide I found for you youtube.com/watch?v=iQ0z5JuoIyU

There are two ways to restore contacts either partially or fully: by ICloud ID for web or from iOS device. Both are simple and fast. You just need to follow these steps https://osxtips.net/back-up-contacts-on-iphone/ and you will succeed.

how can recover my contacts from iPhone that can't restore?