Retire? With unlimited budget? Never!
Make things. Hydrogen powered aircraft (and solar powered hydrogen factories in the deserts). Methanol powered shipping (and carbon capturing methanol plants).
Robots. Aging populations need robots.
An investment bank for micro projects. Like Grameen Bank but equity investments, not debt. Globally.
Maybe think big like
@JohnnyDoe and somehow take over the World's banks and move debt to equity - with no socialised losses.
Lawyers for victims of state coercion, like the Institute for Justice.
And hypnotists for prisoners. Not in a creepy way. To rehabilitate and reduce recidivism, especially in young people.
OK maybe semi-retire eventually. A nice villa on the rocks, overlooking the sea, with two labradors. But not give up on dining or trips to Vegas, so a decent jet would be the main extravagance.
...I have little experience of life....so i Hardly mention anything
But you can dream,
@azb1, dream!