The deeper I get into paid traffic, the more I realize optimization is probably more psychological than technical at the beginning.

A campaign underperforms for 2–3 days and suddenly the instinct is

• change the offer
• change the landing page
• change the traffic source
• change the geo
• launch something completely new

But if too many variables change at once, how do you actually learn what caused the result? I’m starting to think a lot of beginners don’t fail because they avoid testing.They fail because they test too many things simultaneously and never collect clean data.Curious how experienced media buyers decide:
What should be optimized first?