We turn down roughly one in four enquiries, usually because outsourcing would be the wrong move for that business at that moment.
Outsourcing works when the work is specialist, recurring and measurable: marketplace management, paid media, lifecycle marketing, technical SEO. It works badly when the work depends on institutional knowledge that has never been documented, or when the founder is not ready to hand over decision rights along with the tasks.
The honest test: can you write down what good looks like for this function, and would you know within 60 days if it were being done badly? If yes, outsourcing will probably work. If no, fix the definition before you hire anyone, agency or employee.