How to do it right
Try not to retrain campaigns. In the process of work, advertisers regularly have to test new hypotheses. In VK Advertising, you cannot do this on working campaigns. It is better to set up new advertising. This way, you will get high-quality results faster or make sure that the hypothesis does not work. At the same time, trained advertising will continue to bring conversions.
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Mistake #2: A large number of groups with different targeting within one campaign
It is not recommended to create multiple ad groups with different targetings within one campaign. The maximum number is 5, but fewer is better. Usually, a campaign gets oversaturated with groups when an advertiser tests different ideas at the same time.
Groups with different targeting, united by one campaign, indirectly influence each other. This leads to two negative consequences: firstly, advertising cannot achieve positive results, secondly, experiments are inaccurate, their data cannot be considered relevant. As a result, it will not be possible to properly test the hypothesis, and money will be wasted.