I accidentally deleted a very important notebook for me, I didn't make a backup, how can I restore it?

Sorry, it seems there is no way to restore a notebook if you do not have a backup source. That's why I built a feature to back up all sources or download sources in case you make a mistake. Check out the feature if you need: https://www.nlmtools.com/blog/notebooklm-recover-deleted https://www.nlmtools.com/blog/notebooklm-export-sources Thank you