I spent the whole weekend building the perfect a classic open-world RPG setup with about 150 mods. Started it up, and it crashes on the main menu:

Fatal error
The game has crashed and will now close.
DXGI_ERROR_DEVICE_REMOVED
The GPU device instance has been suspended.
No useful error message, just straight to desktop... i sorted with the mod manager's auto-sort but nothing changed. i'm close to tears. How do i find the culprit without starting over?
I have no crash log tool installed yet, and Event Viewer only shows a generic application error. Im willing to put in the work, I just need a method that doesnt take all week.