Sharepoint/OneDrive Shared Library Structure

I inherited an environment with file storage and a couple shared libraries in OneDrive & Sharepoint. It's a smaller law firm and the current structure is like this:

Shared Library -> Attorney 1

-> Attorney 2

-> Attorney 3

-> etc

There are around 600,000 files in the shared library, and it's around 550GB in size.

I'm trying to decide the best way to organize these files and folders for better structure and scalability. I am thinking that the best way is to create a shared library for each attorney and their files, etc can be nested underneath. Any feedback and ideas are appreciated.