In learning war through warfare, Gao Yang has been learning, but this learning is two-way, as his opponents are also learning.
What troubles Gao Yang now is that regardless of how the conflict between the Houthis Armed Forces and the Saudi Arabia has progressed, Saudi Arabia currently has no intention of extensively using mercenaries, and thus his ultimate goal has been unreachable - to get Saudi Arabia to provide the Solar System Company with a substantial business opportunity.
Initially, Gao Yang's strategy was to inflict continuous pain on Saudi Arabia, forcing them to replace their national soldiers with mercenaries. Employing mercenaries merely involves financial costs, whereas using national soldiers results in significant casualties, leading to numerous problems, and the costs are much greater than with mercenaries.
