"Illustrator could not open this file, We tried to read it but it was too damaged to recover."

Hi there,

We are sorry about the trouble. As @Brad @ Roaring Mouse suggested, you should share it with us here. You can upload it to the Creative Cloud (https://helpx.adobe.com/in/creative-cloud/help/share.html) and share the download link here or via DM. We will try to recover it. But I must inform you that file recovery can't be guaranteed with 100% success. But, we'll surely try our best.

Thanks and Regards,

Anshul Saini

If it is indeed damaged, and you do not have any sort of backup, take the advice in the message and send it to adobe to attempt to fix.