I loved writing 'Two Brothers' more than anything else I have written. It's the first book I've written that I've always known I wanted to write. Having said that, it also kept me awake at nights.
For the future, I would suggest avoiding subjects of too vast a scale. It would be useful to make out a list of fundamental questions on the matter to be dealt with, and discuss only those.
I often think about, 'How do we return to a simpler way of living? Is there some way that we can start to think of each other as human beings again, instead of worshiping money, instead of worshiping electronics, instead of worshiping getting ahead just for me?'