Kind of a hard question to answer on the internet, but I would have to say, to live a code I set myself. Sort of golder rule thing, but with many other things in it, like improving myself and grow mentally and emotionally, challenging myself too, trying to help people around me in any way I can and a I try to do stuff that matters to my and people around me daily life. Sadly a lot of the time i don't do that.
I'm sorry if I didn't answer it clearly enough, as I said it's quite hard to answer it on internet, at least for me.
On the other topic, what do you consider fiction then? Would matrix be fiction too, even though there is a possibility we are living in right now without realising it.
Anyway, what's the most important thing in life for you then?