Did your YouTube Shorts campaign ROAS drop?

Was it gradual? Or did it fall off a cliff?

Was it significant, maybe a 30%+ drop with no warning and no changes in the account?

If so, here’s what may have happened:

YouTube Shorts found your best buyers fast. Converted them on the spot or pushed them down the funnel into another campaign.

Then it ran out of new people to show your videos to and ran out of signal.

So it did what the algorithm always does when it runs out of signal.

It started retargeting the same people.

Google calls this optimization. We call it a retargeting loop with prospecting lipstick

The fix isn’t to lower your budget. That signals weakness to the platform and can make it worse.

Three moves to try before you blow it up.

  1. Pause the underperforming asset group for 48 hours. Reset the auction entry point.
  2. Expand your Lookalike from 1% to 5% or 10%. Give the algorithm room to find new buyers.
  3. Swap only the first 2 seconds of your video. A new hook = a new asset ID in Google’s system.

The algorithm needs novelty to perform. You just have to know how to force it to find some.

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20+ years running paid media. Operator Note 3 of 24.
This post is part of my Google Ads Operator Playbook — 24 notes on what’s actually working in Google Ads in 2026. I also cover Meta, Pinterest, and AppLovin if those are on your radar.
#googleads #pmax #dtcmarketing #paidmedia