You have access to a supplier of a rare good meaning you have a form of exclusivity. For example could be gained by travel to China and find something rare but valued in EU. Become an importer of that thing.
Cut a deal with a supplier for exclusive access to their product.
Gain deep knowledge of a complex product (for example circuit board manufacture). Build a system that makes this understandable and usable for a larger group. Exclusivity is the intimate knowledge encoded in the system.
Build up relationships with a group of suppliers and make price knowledge the product for user. For example booking.com, inknomad - be the online marketing for a group of suppliers. The exclusivity is in the large network of relationships.
Take a common problem and come up with a superior solution. Exclusivity is in the idea generation and the creativity.
You become the product. Consultancy, contract work, talks, books, blog posts.
Find the sweet spot as the intersection of these four things:
Building new things using programing, where I am involved in explaining things to people, that helps people improve their skills and gain wealth and results in a stronger community.