The author interviewed hundreds of the most successful people of his day and distilled their success principles.
It's packed to the brim with practical advice about how to run a business, and how to achieve any goal. Worth a read.
TLDR pick a goal you really care about, develop absolute faith that you will attain it (i.e. practice seeing it as already done, until it feels real), lay out a concrete plan of action for its attainment, and get to work!
(The section on quality and quantity of service rendered is of particular interest.)
The incredible ease of modern communication allows businesses to show their offer to many more candidates that previously possible, and allows those many more candidates to respond from a greater distance and with more ease.
However, now there is a new problem - too many offers to sort through. It eats up their time with candidates that don't suit their needs.
So, what do they do? They increase requirements and use automated systems to cull the results as much as possible. They get more and more picky. This is an entirely reasonable answer to the problem.
However, now applicants need to work harder to show they're worth considering and avoid the automatic culling.
It becomes an arm race. Employers have incentive to reduce the incoming applications to keep their workload lower, while applicants obviously want to get the job so must make their application get through.
We are in the early phases of a recession. The tech-cession is already in full swing. Inflation is through the roof.
There are very few jobs hiring relative to layoffs. Every optimization, no matter how stupid, matters.
Capitalism rewards the razor thin margins, regardless of how filled with puss and scum those margins are.