Reminds of something that Paul Graham once wrote: one of the most consequential decisions you can make in life is the city you choose to live in. Now I realize this is just a big constraint you place on yourself: location.
Other big constraints are: marriage, religion, and choosing to go the VC vs. bootstrapped route in a SaaS business. Going the VC route constrains your version of success to extremely high growth (a very successful bootstrapped business would be a VC failure), while going the bootstrapped route constrains your growth rate potential (you might make millions but not billions).
I especially love this heading from the article: Goals are for Games. Constraints are for Worlds. I would add: successful people navigate worlds. Children play games. Many people are still stuck in a game-playing mindset even into their 40s, rather than navigating their world, they are still stuck in a goal-oriented game, such as a "career". Right out of university they look for their next well-defined game. At some point the complexity of the world collapses all your games. Then you hit your mid-life crisis.