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If you would like to try, Joyoshare iPhone Data Recovery [joyoshare.com] can be a trustworthy tool. It has ability to recover deleted contacts from your iPhone, iPad or even iPod touch. The one who has backups in iTunes or iCloud can additionally extract lost contacts to retrieve. Better than others, it won't take up much disk space and the decrypted data saved on temporal file will be removed after data recovery. If you want, you can also apply it to restore videos, photos, messages, call history, calendars and so on.
Related: How to Recover Deleted Contacts on iPhone 7 [joyoshare.com]

The best way to recover deleted contacts from iPhone 7 [mobikin.com] is to use iOS data recover program,which is specially designed for iOS powered device and has powerful methhod to detect the deleted contacts from trash bin.User could preview the deleted contacts in the program and choose the target files to recover on computer.

Of course, you can try checking your iTunes or iCloud backup or some other methods to restore contacts from iPhone 7, but the most efficient and reliable way might be using a professional iOS data recovery software. Among so many similar program, TunesKit iPhone Data Recovery [tuneskit.com] stands out because of its fastest recovery speed and highest success rate. It only takes 3 steps, namely, connect iPhone to computer, scan the data and recover them. That's it. 
See more: How to recover deleted contacts from iPhone [tuneskit.com]

I think the best way to keep your data safe is to backup your data, you can backup iTunes movies, iTunes songs, Apple Music by simply converting them. 
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