I have never disassembled a GPU, lil afraid to do so. I have been seeing some videos on youtube.
Does GPU also have a thermal paste similar to CPU, If I decide to; can I change the paste and see if it helps?
I had this card in an 8 GPU set up the usual way we set up rigs on a mining frame, spacing between cards is enough though to avoid hot air from the adjacent GPUs to directly blow on this.
Shall I get a GPU cooler fan something like this might help
https://www.amazon.com/gp/product/B07XCFB5WP/Weather wise it is getting cold here in Arabia so I will not run into heating issues until March with this type of table fan set up, but after that.....
Do not disassembly your card because you'll lose warranty
Wait a little more because more people can help you to find a solution here, it's not normal to need a table fan to keep your card running 100%, and you already reduced the TDP, so the card is not running at full power or above specifications, Nvidia are good to lock the bios so it's hard to mess with the card