After researching the use of mineral oil for cooling PC components published here on Youtube. I apply that knowledge to this project and it works as expected. I just wanna give thanks to Flispky for making an enclosure because I know this was possible even if the intended purpose of the product is not marketed as.
I still ran into issues with the push button switch and corners of the XT90 connector leaking and some of the holes need to be sealed. It was originally designed to be waterproof. It was not designed to hold liquid contents but I think I debunked if this controller can be considered waterproof if I can dunk this in water for an extended period of time.