Sometimes a marketing plan just does not perform no matter how much effort is put into it. The best time to stop is when data shows no real improvement after many tests and changes. For example, if ads bring traffic but no one clicks, buys, or signs up after several tries, the approach may not fit the audience. A good sign to pause is when the cost keeps increasing but results stay flat. It is important to review the message, platform, and target group before giving up completely. Testing new angles or formats can sometimes revive the idea. How long do you usually wait before changing or stopping a marketing plan?