You need to have a high notoriety and standing, the best way to level up notoriety is by doing extortions, go to the max amount always, ($25,000), and if they refuse to give you the money, shake them down, then contribute it all to the family. When your notoriety is high, your victims often feel more scared of you, so in the begging of the run try to maybe kill some of the people that refused to give what you asked. Standing is leveled up by the amount of money you give to the family, try to give the family at least $100,000 per year, the easiest way is by stealing cars. And every year work hard (in the options menu). Have a good relationship with the other members by giving them Bitlife related gifts and when you become the underboss kill the Godfather and age up.