recover my messages

After changing phone number all the messages have been deleted from my whatsapp. How can I recover my messages? Can I find somewhere extra saved copy of my chat? Or maybe I need to reinstall whatsapp? Help me please. I already tried to use old phone number again but still everything the same, my chat is empty.   I really like whatsapp and I use it every day. But now I don't know what to do. I lost many important information.
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