Q4 performance is decided in September, not in November. CPMs rise structurally from October onwards, ad fatigue accelerates at higher budgets, and traditional creatives burn out faster. The solution is an early creative pipeline built on UGC: 30 to 48 variants as a baseline across all funnel stages, testing in October, and scaling with proven creatives in BF week. For the briefing: specify seasonal hooks explicitly, request several hook variants per creator and clarify usage rights upfront. The later you start, the more expensive every signal you buy in testing becomes.