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Have you tried disabling each one of your GPUs alternatively and check if it works? If any of the GPUs failed due to overheat maybe some connection just melt down and anything you try to do with software will not help you.

Games crashing on startup isn't the typical sign of faulty GPU hardware. Faulty GPU hardware typically manifests in visual artifacts and games locking up. Crashes on startup would point to a software issue. The screenshots seem to indicate that Windows isn't seeing your Nvidia GPU, or having a driver issue. The iGPU may be disabled in the BIOS.

You said you did a clean install of Windows? Is it possible that you forgot to install some chipset drivers, or something similar? I would take a look through the driver page for your laptop and try to download and install every Chipset / System / Video Card driver you can find. USB and Audio not working are another sign that you're missing laptop specific drivers.

I would also take a look at the BIOS to see if there's a way to enable the iGPU, because it seems to be disabled currently.

There is a yellow exclamation mark on Nvidia GT 755m. When you right click on it and choose properties, do you see any error codes?

The only thing you can do is disable the switchable graphics in BIOS if there is an option for that and use the one in the CPU package. The laptop should work with Microsoft basic display driver as well, but no gaming on that. As far as repair goes, you can always go for re-ball on the GPU, but this usually doesn't last long (6 months to 2 years max in my experience), depending on the person performing it and how much damaged it is. So yeah, unfortunately your best bet is a new laptop.