I've looked through quite a few other posts about this issue and they always seem to get resolved by some iTunes or document storage that the Mac is accidentally tracking as part of the "other" storage. But my Mac has no files on it except for System files and Steam. I used it a long time ago but wiped everything clean, now there's 87GB of other files somewhere? I don't see them in any directory, DiskDaisy shows them as in hidden hidden space, but I don't have the money to pay for DiskDaisy to do Admin Scan. I just want to be able to use my Mac again lol.
No TimeMachine, no caches that I can find, I've tried quite a few things so far
I'll continue looking while I wait to see if this gets any responses, getting frustrated here :/

df -hto see how much space is listed in the Used column for the volumes "/" (core system files), "/System/Volumes/Data" (almost everything else), and "/private/var/vm" (virtual memory). Do those add up to the roughly 105GB used? If not, open Disk Utility, choose View menu > Show All Devices, select the container on the left column, and see what volumes it lists and how much space they use. – Gordon Davisson Apr 16 '21 at 23:34https://i.imgur.com/LzETH9o.png
– Trevor Alan Campbell Apr 17 '21 at 08:27sudo du -hxd1 /System/Volumes/Data(it'll ask for your admin password; it won't echo anything as you type). That'll probably still get some errors, but hopefully it'll be able to show which subfolder is huge. If necessary, you can run e.g.sudo du -hxd1 /System/Volumes/bigfolderto narrow it down further. – Gordon Davisson Apr 17 '21 at 09:07