Chosen Solution
I lost all my data while installing new MacOs … any way to get all the data back including my Safari bookmarks password and everything?
If you never reinstalled macOS you may be able to partition recovery or recover files using some software or bootable partition manager. I think EaseUS do Macbook recovery software, I have got a few things back from customers using their free version :) Other than that it is likely that your data is gone unless you hold time machine backups or cloud backups
