Scale when the evidence says you are capacity-bound: demand you cannot serve, messages you cannot answer, content you cannot make fast enough — and numbers that show the page already converts and retains. If the fundamentals are shaky, scaling magnifies the cracks rather than the income.
Be honest about the trade. More reach and more systems mean more complexity and, often, more people involved — which raises both your costs and your risk surface. Scale because it serves a goal, not because growth feels obligatory.