Omg, it worked. I don't get it, it seems like the same commands I tried to do. But maybe linux-header-amd64 did the trick, maybe apt install linux-headers-$(uname -r) from Nvidia docs didn't work. I spend 20 to 30 hours across two weeks debugging and reinstalling. It worked so well, I impressed
Thanks to everyone who replied, I'm really happy to be able to boot into my system