This is only true locally. I can derive a huge amount of happiness by being the best singer at a party, or the best at telling jokes in the pub, or the best at $SKILL in my team.

Even if you consider global geography (as with competing on the Internet as a startup, or looking for a job as a remote worker), you only have to be the best in that narrow area of what is available at that time (or the best at marketing it, or the best at selling it, or just the best at turning up and being presentable).

There are many, many opportunities to be "amazing" locally. You just need to define what, and where. The article uses the word "mindset", because happiness about what you think more than anything else.