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Case studyEcommerce7 days post-change

Real client numbers

YouTube conversions +100% with no spend increase

Excluded app inventory + tightened signal quality

Conversions lift
+100%
Spend change
Controlled
Conversion quality
Materially improved

Three coordinated fixes

What we did

  1. 01

    Excluded all app inventory from the campaign

    Biggest impact came from a single decision. App inventory inflated volume but conversion signals were noisy. Learning skewed toward low-quality actions. Once apps were removed, conversion quality snapped back immediately.

  2. 02

    Built a conversion-focused video system

    Not just "more creatives." A conversion-led structure: strong high-impact hook in the opening seconds, clear product framing early, multiple video variations from the same core script. Goal wasn't views. It was qualified action.

  3. 03

    Layered a purchaser-based first-party audience

    Built a lookalike audience from all past purchasers. Layered it into the campaign as a signal input. Anchored YouTube's learning to real buyers and accelerated post-change stabilisation.

Where these numbers come from

Patrick first wrote this account up on the newsletter on 24 January 2026, the week the numbers landed. The figures on this page come from that write-up.

Read the original write-up

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