traffic exchange sites
https://trafficexchangedirectoryplus.greyhavendaily.com/posts/how-to-choose-a-reliable-traffic-exchange-directory-for-manual-surfing
Traffic exchange sites are platforms where website owners agree to mutually promote each other's content, often by displaying ads or links. Participating sites earn credits for showing others' links, which they spend to get their own shown elsewhere. People use these to boost visitor numbers, but it's important to know that quality can vary and some networks have strict rules to avoid spam.