“We need more customers” is really three different problems wearing one name: (1) nobody can find you, no visibility; (2) people find you, but the wrong people, a targeting problem; (3) the right people arrive, but don't buy, a conversion problem. Treating all three with “let's run more ads” is usually the wrong diagnosis, and it spends the budget in the wrong place. The next three sections treat each problem on its own.