The bottleneck was at the bottom of the funnel.The problem never was.
Financial Reporting & Accounting sat at the bottom of a funnel fed by almost 200 people. My own team was drowning in overtime, and the obvious read was that we were understaffed.
It was a symptom: every area upstream produced something slightly different from what the next one needed to consume.
I proposed going area by area, mapping what each one fed and what each actually required, and fixing the mismatches at the source. Sixteen people worked the problem with me.