Well, let me guide you how to use iPhone WhatsApp Recovery, which is a multifunction app to recover your lost WhatsApp messages, WhatsApp attachments, SMS, and more in three simple ways: Directly restore from iPhone, restore from iTunes backup, or restore from iCloud backup.
Steps to Directly Recover Deleted WhatsApp Messages/Chats from iPhone
Step 1. Download iPhone Data Recovery on the Computer
Set out to install iPhone Data Recovery and run it correctly. Then connect your device to your computer.
Step 2. Select the Appropriate Type to Scan
When iPhone Data Recovery recognizes your iPhone, you will see mode on the left and some file type on the right. Choose "Recover from iOS Device" and "WhatsApp ＆ Attachments" and click button "Start Scan". Then you just need to wait a few seconds for scanning.
Step 3. Preview WhattsApp Messages and Recover Them
After scanning, it will provide all found messages data for you, and you can select "WhatsApp" on the left. Then all WhattsApp messages will come up in the window on the left.Preview one by one and tick what is you need. Eventually, click the button "Recover to computer" to save them.
When you have completed the above steps, I believe your chats have be restored and you can chat with your friends as before.