I wanted to post a few days after I check the stability of the PC but since you wrote here, I'll explain:
So... after doing all the stuff mentioned in this thread, my PC was still getting a lot of...

Nope... I just had a BSoD again... So replacing the GPU is the only option that I have?

I tried unplugging the second monitor, and I still got the BSoD. I switched both of the monitors to 60 Hz just in case.
Also I have updated some drivers via DriverEasy. I will keep you updated.

Yes

So is there nothing that I can do, but replacing the GPU?

I tried installing the newest version of the driver, didn't work. I also rolled back the driver to a pretty old version, also didn't work. I don't have a spare GPU to replace it, so I haven't tried...

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I ran it, the temperature didn't rise above 58C

For how long should I do this test? And I had no updates.

I've got a pretty decent pc (will post specs if needed), and since like 3 months after i bought it, i had these BSoDs: kmode_exception_not_handled, DRIVER_IRQL_NOT_LESS_OR_EQUAL,...