How do I adjust a marketing campaign when a channel underperforms?

You can plan a campaign. That is a real skill, and it puts you ahead of most. What stops you is the live moment, when a channel is underperforming and you have to change course while it is running. That is harder than planning, and not knowing yet is not a failure. It is the next thing to learn. Adjusting mid-flight feels scary because it seems like admitting the plan was wrong. It was not wrong; it was a bet, and now you have data the plan did not have. The skill is not planning perfectly. It is reading the early signals and moving money and effort toward what is working, away from what is not. A campaign is meant to be steered, not just launched. Set your triggers before the next campaign starts. Decide in advance what number tells you a channel is failing and what you will do when it hits. When the rule is set ahead of time, adjusting becomes a calm, planned move instead of a panic. You steer best when you decided where the lines were before the pressure came.