System Data has maxed my HD out!

Handlez wrote:

I've spent hours researching threads through here and other websites but I'm not getting anywhere with this one.

As you can see the 'System Data' category on my HD is at almost 300gb and therefore my Mac is just not letting me do anything. I'm a graphic designer and I can't save new files or do simple tasks as there's just no room apparently.

https://discussions.apple.com/content/attachment/bb1b649f-2fbf-4cc3-a07e-dbdbf3e895f1

I've tried everything. I've deleted caches, uninstalled WhatsApp, there's nothing in my trash or downloads folders and I don't use Time Machine so there's no snapshots taking up any storage. I also don't use my Mac to back my iPhone up so there's no old backups there. I'm absolutely baffled where this 'System Data' is coming from. I remember I had this issue last year on my iPhone and if I remember correctly I deleted media/cache on Telegram and WhatsApp and it fixed it, which is why I uninstalled WhatsApp altogether on the Mac but it only saved me 4gb or so.

All of my work is saved on Google Drive which I believe is part of the red 'Documents' bar, not the grey 'System Data' bar.

Can anyone help please? I literally cannot do any work because of this.

Lets see the big picture from the Terminal.app copy and paste:

diskutil list internal

For the benefit of everyone, what was the path of the Google Drive Folder? I don't use Google drive so I can't provide that.