Have you tried a sensory deprivation tank? Sounds right up your alley.

No Man’s Sky. The main story will make you feel insignificant in the universe.

The fall off on ram performance vs cost is to the point where it’s not worth spending extra money. That kit picked out will be good.

You actually have a very solid pc picked out. I’d say the other details needed would be what quality you want to play the games at. You’re likely good with the 6700 xt if you don’t want to max every game and get the 165hz to match the monitor. If you’re not trying to push the envelope while on a budget, I’d feel very good with that part list.