The successful Christians I know who worship God and attend bible study have at least one of two traits:
They are either extremely humble or they are compassionate.
Humility is enough to advance your career prospects in life.
Compassion is enough to build your relationships in life and bless you with unusually good luck.
And when you are both humble and compassionate, your potential in life is even greater.
And Jesus said there were many mansions in his house, which means, you are not in competition with others. The happiness of others is not a threat to your happiness and your happiness is not a threat to their happiness. God is powerful enough to bring happiness and success to everyone who follows him, either on earth, or after death.