How do I stay motivated when almost no one reads my work?

You can write a brief that wins on the page, and you are tired, tired of pouring your best thinking into documents almost no one will ever read. That fatigue is fair. It is hard to give your finest work to a void and keep giving it. But notice what you are measuring by. If the reward is readers, this work will always feel thin, because the audience is small by design. The truer reward is what the brief does: it protects someone, wins something, moves a case that changes a real life. Few people reading it does not mean little depending on it. Often the opposite. So shift what you count. Let the win be the point, not the readership, and let the mastery itself be a quiet satisfaction you do not need a crowd to confirm. And if you need more than that, find one arena where your writing does reach people, an article, teaching, mentoring. But do not let a small audience convince you the work does not matter. It matters exactly where it lands.