Your Node.js portfolio should showcase your best projects, including descriptions, technologies used, and links to the live applications or GitHub repositories. Highlight any projects that demonstrate your skills in real-time applications, REST APIs, or databases, as these are highly sought after by clients in Latin America.

You can find freelance clients through platforms like Workana, Freelancer, or Upwork, which are widely used in Latin America. Additionally, leveraging social media and local tech communities can help you connect with potential clients looking for Node.js developers.

Rates for Node.js freelancers in Latin America can range from $15 to $50 per hour, depending on experience and project complexity. It's essential to research market rates in your specific country, as they can vary significantly, with countries like Brazil and Argentina often offering higher rates.

Promoting your Node.js portfolio can be done through social media platforms like LinkedIn, where you can share your work and connect with potential clients. Additionally, consider writing blog posts about your projects or participating in community forums to increase visibility and establish credibility in the freelancing space.