Online marketing unfortunately does not work on auto-pilot, constant control and adjustment of campaigns is a prerequisite for satisfactory results. Even those who bring external service providers on board for SEA, social media marketing, display advertising or other divisions should always stay in touch with them.
Besides the daily business, there is unfortunately often too little time for these measures and a campaign is labeled as not profitable, although it would be profitable with a few small changes.
For this reason, the marketing mix should not contain more elements than you are able to monitor and overview. The use of analysis tools and BI software can of course provide relief here.