Executed a high-impact YouTube advertising campaign over 30 days that combined sophisticated audience targeting with dynamic creative optimization. Leveraged custom intent audiences built from search behavior and competitor analysis, complemented by detailed demographic layering. Implemented a multi-format approach using skippable in-stream ads (85% of budget) and discovery ads (15% of budget) to balance reach and conversion efficiency. Conducted weekly creative refreshes based on heatmap analysis of viewer drop-off points and A/B tested 8 different call-to-action approaches.