I think you need to work on the pitch a bit and probably tone it down. Multiplying the promises under "Skills and Insights You'll Acquire" with "Who This Book Is For" just seem wildly unrealistic for one book and an oversell.
I get the vibe of a "become a 10x developer from scratch and land a rock star job in a month" bootcamp. 2/3 of your audience are likely to have seen enough of this already to be turned off. Meanwhile, perhaps some more junior will be intimidated and say "not yet" by the supposed advanced level (the material is also targeting people 10-20 years ahead in their careers after all...)
If you write another book in the future, I'd suggest splitting it into a couple more focused ones, rather than trying to cover all these dimensions for all seniority levels at the same time.