Can I delete WhatsApp without losing my data?

So, my iPhone fell, and the screen turned blue. After a few seconds the screen went black and I was able to turn it back on though. But as I opened WhatsApp it crashed immediately and went back to the home screen. I'm not able to open WhatsApp anymore, and I've read that I need to reinstall it to get it working again.So, first I backed up my iPhone and then uninstalled WhatsApp and installed it again. Only problem now is, I've lost all my chats. Is there a way (maybe with the backup I've made) to get all my chats back? There are some extremely important chats in there.

Oh, and by the way, I backed it up after my WhatsApp wouldn't open again. I've already reset it and restored the backup, but it still crashes.

I find this mac app can extract and backup iPhone WhatsApp chat messages.
http://www.datarecoveryforiphone.com/whatsapp-pocket.html. Hope it can help you.

If it works, can you give me the best answer?

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