A Few Months? That's a really tough way to learn this lesson; you backup after Every work session, or at least every day. I will work in the morning, backup, work in the afternoon, backup. You let the program "rotate" backups = keep 3 or 5 or 6, and it offers to delete the oldest, when you make a new one.
If you have no access to the file, and you made no backups to any external device (USB, Cloud), then your file is gone.