“The two most important days of your life are the day you were born and the day you find out why.” ~Mark Twain. It’s difficult to disagree, however..
I think Mark may have left out a few days of equal importance because the days I found out what I didn’t want to do are as memorable as the other days.
Finding out what you were meant to do is a process of elimination. When you cross out all the things you don’t want to do, what remains is what’s meant for you.

I only advice I could possibly offer is, cut out as many things as possible as early as possible.