For most people, creativity is precisely the ability to pursue multiple interests at once, and then bring them together in new ways. “Without contraries is no progression,” William Blake wrote.
Furthermore, living a great life is more important than producing great work. A life devoted to one thing is a stunted life, while a pluralistic life is an abundant one. This is a truth feminism has brought into the culture. Women have rarely been able to live as monads. They were generally compelled to switch, hour by hour, between different domains and roles: home, work, market, the neighborhood.
A better definition of success is living within the tension of multiple commitments and trying to make them mutually enhancing. The shape of this success is a pentagram — the five-pointed star. You have your five big passions in life — say, family, vocation, friends, community, faith — and live flexibly within the gravitational pull of each.
You join communities that are different from one another. You gain wisdom by entering into different kinds of consciousness. You find freedom at the borderlands between your communities.