Can you become a successful Forex trader? Yes. The market never changes. In order to win you need to change. That's the "big secret".
A quote by Sun Tzu, in the "The Art of War":
“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.”
― Sun Tzu, The Art of War