Not to mention luck.

If you try against all failures and are persistent and you finally get lucky.

Versus giving up after first or second failure.

Is it still luck that is most important?

Depending on your background the luck variable will be different and you may have to try more or less times to get a successful outcome.

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"?