When clients are cautious with budgets, focus on campaigns that deliver clear, measurable results. Start identifying their most profitable channels and prioritizing high-impact strategies, like retargeting past visitors or optimizing existing ad sets. Show them how every dollar is working by providing transparent, easy-to-understand reports with clear ROI metrics. Propose small-scale tests for new ideas, so they feel confident about scaling up later. Keep communication open and collaborative. Ask for their input, address concerns, and align on goals.