What is most likely to help you reach the top?

lifehack.org: "When it comes to success in today’s world, being the kind of person others like outranks all of the fashionable traits like competitiveness, willingness to work harder then anyone else, piling up qualifications, or blind obedience to the demands of the people at the top. Pleasant, likable people have the best chances of being hired, promoted, and rewarded. Customers are more willing to buy from those they feel good around—even if they aren’t offering the best deal. Bosses who are well-liked get better performance from their staff and face fewer people problems. Subordinates who get on well with everyone are trusted more and given better assignments."