Know the power of your voice. Know when to use it (when to speak) or when not to. Know how to use it. More is not better (it’s not how much you say, it’s what you say).
Speak up for what’s important to you and learn to let things that don’t matter go. You don’t have to win every battle (or argument), as it may end up costing you the war (damaging your relationship with those you’re arguing with).