> If you want maximize your chance at success, you need to do something non-scalable.
What is the meaning of 'scalable' here? Popular/widely-known?
It means you can only sell the product on a case-by-case basis, and it does not scale.
Author: scalable. One book can be sold to 1 person or 1,000,000 with little extra work.
Barber: non-scalable. One haircut can be sold to 1 person, but not 2 people without doubling the amount of work.
Focus on your mental health. Life is hard. Treat the people you care about well because they're really what you have in life.