Many years ago a wise grandfather told me "Lonnie, you want to try and fix the whole world. God doesn't call you to do anything but work to ensure your own backyard is in order." His point being that if God needs us for bigger things he'll let us know. In the meantime we just need to do the next right thing.
I was reminded of this principle in my morning quiet time today when I read "Sovereign Lord, make clear to me Your agenda for my world. I want to cooperate with You on Your plan, not waste efforts on my plan."