We, humanity, are an information network. Getting fixated on one forum is a bit like talking to only one person - soon you're going to be preaching to the converted, or end up having the same argument you've been having on a hundred occasions before.
When I notice that I'm about to post to this forum about a topic that was covered here well before, I try to think if I might know of another forum, social media, site or contact where the same piece of information be more controversial, surprising or interesting. Only posting to places where it is relevant, or where you assume it will be well received, traps the forums into monotonous, recurring cycles.