Week one: list top overdue balances by amount and age. Assign owners and send consistent multichannel reminders. Many DSO issues are follow-up gaps, not customer malice.
Week two: clean invoice data (PO, VAT, delivery proof). Disputes mask themselves as slow pay. Separate dispute cases from pure collection to stop double counting in reporting.
Week three–four: automate recurring steps with a debt collection software workflow so nothing waits on someone’s inbox. Measure DSO weekly; OptiBFR is built for that loop.