We can easily edit existing contacts when changes are made, so there is no need to first delete and then create a new contact.

Android 10 (One UI 2.0)
Step 1:  Open the  Contacts -App
Step 2:  Tap on desired  Contact
Step 3:  Tap on  Edit
Step 4:  Edit Contact  details  and confirm with  Save
  1. Open the Contacts-App
  2. Tap on desired Contact
  3. Tap on Edit
  4. Edit Contact details and confirm with Save

Samsung Instructions
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