User Flow for a B2B E-commerce App

I have been researching for quite some time on how to enhance a better user experience for B2B e commerce websites like Alibaba, Indiamart.
Drawing a user flow map helps me to identify and solve more problems. The complexity of the b2b is such that it's difficult to identify a proper user journey as there are many stakeholders with multiple entry and exit points in the flow.
But this is a start to break down the complexity into small achievable goals.