The call usually comes at the same moment. Revenue has flattened or the curve has bent the wrong way, spend has not gone down, and every individual channel report still says the channel is performing. Nobody is lying. Each vendor is optimising the thing they were hired to optimise, and each one is hitting their number. The business is still not growing.
That happens because the commercial side of the company was assembled one purchase at a time. An agency for paid, a freelancer for search, a tool for email, a dashboard bolted over the top of all of it. Each arrived with its own definition of a conversion, its own attribution window and its own report. What never got built is the thing that would tell you how a euro entering the top becomes revenue at the bottom - and which of those euros you could stop spending tomorrow without losing anything.
So the first job is not a campaign. It is finding out what is actually load-bearing in your commercial system, what is decorative, and what is quietly costing you margin every month.