Most influencer campaigns fail on measurement, not creative. If you can't attribute outcomes, you can't optimise, and you're back to guessing.
Start by defining the KPI before the campaign: installs, sign-ups, sales, or a specific ROAS target. Everything downstream is built to serve that number.
Then instrument it. Tracking links, unique promo codes and post-purchase surveys let you attribute results to individual creators. That's how you learn which partnerships to scale and which to cut.
Report weekly, not at the end. Continuous measurement lets you move budget toward winners mid-flight, which is where the biggest ROI gains actually come from.