"How to be Impatient" would have been a better essay. This essay doesn't provide any actionable advice. Maybe because there isn't any. The Sam Altman quote seems to indicate it is an intrinsic quality you are born with.
"Some of these characteristics seem to be easier to change than others; for example, I have noticed that people can become much tougher and more ambitious rapidly, but people tend to be either slow movers or fast movers and that seems harder to change. Being a fast mover is a big thing; a somewhat trivial example is that I have almost never made money investing in founders who do not respond quickly to important emails."