Being able to start over. An essential skill in today's world.
Train yourself to think that tomorrow there might be no job, no home, not even a country. What then will I do?
What skills do I possess that will be useful in a new life? What am I prepared for and, most importantly, what am I not prepared for?
Have an 'emergency suitcase.' A sum of cash. The phone number of a reliable friend.
And most importantly, the hardest part - have no regrets. The past is an illusion. The future is reality, and you are heading towards it.