To build a strong portfolio as a digital nomad, start by identifying your core skills and selecting projects or samples that best demonstrate your abilities. Create a visually appealing and user-friendly website or online portfolio that showcases your work, including case studies, client testimonials, and examples of successful projects. Consider offering your services at a discounted rate or even doing pro bono work initially to gain experience and expand your portfolio. Actively seek feedback and iterate on your portfolio to continually improve its impact.