I skimmed this briefly but I can't reiterate enough the importance of practice that the author mentions.
I am the same person when a FAANG hired me as I was 15 years prior when I first interviewed there (I also interviewed a bunch of times in between, for successively more senior roles and did better in the process each time.)
When I was young, I had some fixed mindset - I am either good enough or not. They will either see that I am good or they won't. Nowadays, it's obvious to me that it's my responsibility to make it easy for them to see that I am good. That's what practice is - it's you working on your ability to articulate your fit for the role. That could be your ability to solve problems at the whiteboard, honing your career story, etc - the point is that if you ultimately don't have something to offer, no amount of practice will help - but if you have the potential but don't know how to let it show, you won't get the job either.
I am the same person when a FAANG hired me as I was 15 years prior when I first interviewed there (I also interviewed a bunch of times in between, for successively more senior roles and did better in the process each time.)
When I was young, I had some fixed mindset - I am either good enough or not. They will either see that I am good or they won't. Nowadays, it's obvious to me that it's my responsibility to make it easy for them to see that I am good. That's what practice is - it's you working on your ability to articulate your fit for the role. That could be your ability to solve problems at the whiteboard, honing your career story, etc - the point is that if you ultimately don't have something to offer, no amount of practice will help - but if you have the potential but don't know how to let it show, you won't get the job either.