Some strategies seem brilliant on paper, but quickly lose their lustre when it comes to execution and many assumptions turn out to be incorrect.
Realizing you’ve made faulty assumptions isn’t failure. Failure is not having the humility to see the faulty assumptions as feedback to help you change course.
If some of your assumptions turn out to be incorrect, iterate.
Examine your assumptions and revise your strategy accordingly, investing more in correct assumptions, divesting from incorrect assumptions, and testing new assumptions.
Truly brilliant strategies involve marking up the paper based on the feedback of execution.