That's just way too outdated. Nowadays best way to earn valor is wait for weekend or mid-week events that pop up and go take part in that battlefield/event. By far the one with post participations is plateau event, other than that there are some new battlefields starting from level 5. That's the current state of the game.
It's better to be silent and be thought a fool than to speak and remove all doubt. What's even better is to weaponize your words to destroy anyone who dares challenge you.