Open the App Store
Tap your profile icon
Tap Purchased
Tap My Purchases
Find the app you want to restore
Tap the download icon next to the app
Enter your Apple ID password if prompted
Open the app after it finishes downloading
If the app is missing, search for it in the App Store and download it again
If you backed up your iPhone, restore from an iCloud backup or computer backup
Go to Settings
Tap General
Tap Transfer or Reset iPhone
Tap Erase All Content and Settings
Follow the setup steps
Choose Restore from iCloud Backup or Restore from Mac or PC
Sign in and select the backup containing your apps