What if the purchasing leader is unwilling to recruit new people?

This situation can provide a solution.

You can provide a recruitment plan, including the recruitment plan, training plan, budget and other details of relevant personnel, so as to show the leaders the value and necessity of new people to the company.

If the leaders are still unwilling to recruit new people, they can consider other alternatives, such as increasing the number of seconded personnel, reducing the workload of some departments and outsourcing.