The first step in measuring the success of a particular marketing campaign is to decide what you want to track in the first place. While you may be looking to do a variety of things with your marketing campaign, usually one goal is paramount.
https://www.cmo.com/features/articles/2017/6/29/one-size-doesnt-fit-all-when-measuring-marketing-success.html#gs.sbN0AqA
A marketing campaign’s return on investment as a metric suggests that all communication will directly contribute to sales return. The fact is, however, that value comes in all different shapes and sizes.
https://www.inc.com/jon-miller/marketing-metrics-for-success.html
There are hundreds of inbound marketing metrics to choose from and all of them add some type of value. Keep in mind, however, that it is important that you measure results, not just activity.
https://maximizesocialbusiness.com/6-content-marketing-metrics-you-cant-afford-to-ignore-35072/
While the metrics you track will depend on the goals of your project or campaign, there are a few metrics you should never ignore.