Blue door without question. Even if there was a stipulation that I couldn’t invest in stocks or bitcoin or do anything else that would make me rich.
I fantasise about going back and doing it all again, not making huge changes, but little ones, living my life with the knowledge and security I have now, so I would be able to enjoy my childhood instead of stressing about the future, I could be kinder to people around me and help them when they were struggling. I could tell the people I loved that I loved them instead of keeping those feeling held back due to insecurity. I could spend more time with my pets when I was “too busy” before. I could start the hobbies and sports I ended up loving as a child, and actually have the chance to be competitive at them.