28/08/2026
Doubling the budget is not scaling. It's a reset.
The scenario every e-com founder knows: an ad set is flying at 4X. Obvious move — take it from £200/day to £500/day and enjoy the weekend.
Monday morning it's at 1.4X and nobody can explain what happened.
Here's what happened. A significant budget change pushes the ad set back into the learning phase. It re-explores, delivery widens, CPMs shift, and the optimisation profile you spent three weeks and real money building gets partially thrown away.
You didn't scale a winner. You reset it and then judged it on its worst week.
How to scale without breaking it:
→ Increase by 20–30% at a time, then hold for 48–72 hours
→ Only increase again once performance stabilises at the new level
→ For bigger jumps, duplicate the ad set at the higher budget and let it learn in parallel — the original keeps earning
→ Never increase budget and change creative in the same move. You'll never know which one caused what
→ Scale on a 7-day rolling average, not on yesterday
Slower is faster. A 20% increase every three days is 6X the budget in a month, with the learning intact.