Lowering CAC is rarely about one tactic. It usually comes from improving the full system: better targeting, clearer offers, stronger creatives, more relevant landing pages, and tighter follow-up after the lead is captured.
One of the fastest ways to reduce CAC is to increase conversion rate. If more visitors convert from the same traffic volume, acquisition becomes more efficient without needing lower click costs.
It also helps to separate high-intent campaigns from awareness campaigns. Branded search, bottom-funnel keywords, remarketing, and high-converting audience segments often deserve more budget than broad campaigns that look active but do not generate efficient results.