well it's like 50:50 both are needed in the road to success. if you try but it fails because of misfortune it's like the thing that makes us disappointed. but this luck does not come from effort but from our supplication to god. Luck is invisible so we have to know when we should feel lucky when we shouldn't chase something if it becomes a failure in the future.
Honestly some individuals did absolutely all the needed requirement to become successful unfortunately luck wasn't on their side despite all their efforts which was in futile, meanwhile some did even lesser than those requirement fortunately they became successful thus it is an equal chance of becoming successful, though in some cases country of residence also determine success, for instance we can't compare success rate in a developed country with the success rate of a developing country due to disparities in amenities and infrastructures that will bring about success with a little luck those countries.