To build an audience on Pinterest, start by creating high-quality, eye-catching pins using a vertical format (2:3 ratio). Optimize your profile with a clear picture and a keyword-rich bio. Incorporate relevant keywords in your pin descriptions and board titles for better searchability. Pin consistently, mixing your content with re-pins from others. Engage with the community by following users, commenting on their pins, and joining group boards. Stay updated on trending topics and seasonal content to attract views. Finally, consider using Pinterest Ads to expand your reach and gain more visibility for your pins.