A third challenge of developing a brand voice and tone is to keep it relevant and authentic to your audience, your industry, and your brand. This means that your brand voice and tone should reflect your audience's needs, preferences, and expectations, as well as your industry's standards, trends, and best practices. It also means that your brand voice and tone should be true to your brand's identity, values, and promise. To avoid irrelevance and inauthenticity, you need to listen to your audience's feedback, comments, and reviews, and adjust your brand voice and tone accordingly. You also need to stay updated on your industry's changes, opportunities, and challenges, and adapt your brand voice and tone accordingly.