the challenge is the rank up to Sr. Member, hero and legendary, however you won't feel it's hard if you are enjoying your life in the forum, instead, once you are ranked up, you might miss yourself when you are still in low rank.
whether our personal main achievement in this forum is "Legendary Rank"?? A high rank does not promise that you are knowledgeable and a low rank does not prove that you are a beginner. on average, many starter topics that get many Merit that I see are members who are good at reading opportunities (even though their topics are not educational).. don't force yourself, because a low rank isn't too bad 
It should be also a system where the merit can be airdroped to users that are constantly active and they posts have nothing to do with plagyarism. Simply reward content creators that are on topic.
Merit rotation is spread everywhere *I hope you understand what I mean 