Your goal is to build a team that constantly surprises you. You should be hiring for people who do things you can't, who are better than you. Let go of your ego, you can't be the best person any longer. You must accept that you're managing people who are superior. Your job will now change, you become an enabler, a remover of friction, one who creates an environment for the special people you are now responsible for. Make them happy and free to do their work so they can delight themselves and you.