How do I restore a deleted contact

Unlike some Android devices, contacts are neither stored locally on an iPhone nor in SIM. They are synced to an email account that you had Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other

If Contacts on iCloud, try this --> Restore contacts, calendars, bookmarks, and more using ...

Else add the email account that stores your contacts.

Last week, the local Apple store helped to back up my iPhone 12 Pro Max. But when they were done and restored the data to my new uPhone, only a small portion of my contacts were there.

i desperately need help.