Countless things, if we keep worrying. But one truth is that we are managing.
Tough times comes and goes. One never has to worry so much about, whether I will die or survive in this situation. It's more about living the phase, whether its in our favor or in our oppose.
What I am learning or learnt so far is, getting to live as a Human [most intelligent species on the earth] is the biggest blessing of all. Its very easy to divide ourselves with those norms, as its more convenient or comfortable for some of us to be in own circle like regions/languages/countries etc.
When it comes to leadership, its hard to balance everything, but achieving team trust, being a provider to the team [whatever team needs], being unbiased are some of the things, which are easy to achieve being at leadership level.