You can create a number of promo links, and even have more promo links links that there are slots to show them. In this case, the system will rotate them.
For instance, you could create a promo link to join an email list, a promo link to download a white paper and a promo link to download your app.
Then you could choose that you only want 1 promo link to show in the Explore section.
You do this on the main Promo links page:
Contextly will alternate the promo links automatically.