Luck is a huge factor in your starting point. It's significantly harder to become a millionaire if your starting point is a group home in a poor country. An unlimited amount of persistence can't overcome those odds.
That is attacking a straw man. Discussion is about self control not things outside of ones control.
I am also not talking about becoming a millionaire.
I am talking about simple things like getting a decent job. If I sent 2 CVs out and gave up can I compare with someone who sent 100 CVs out and got the job? Can I say "he just got lucky"?
Versus giving up after first or second failure.
Is it still luck that is most important?