Again, I don't understand activity at all and don't understand the 2 week time. Could you explain when my activity will rise?
Say you have 2 people, a spammer who might be like you who spams 30 posts in a day, and a normal guy called diamond
From Lets say May 1st to 14th: you have 420 posts : Your activity = Time * 14 = 1* 14 = 14 ACTIVITY
From Lets say May 1st to 14th: Diamond has only 3 posts : Diamonds activity = Time * 14 = 1* 14 = 14 ACTIVITY
It basically means it doesnt matter how much you spam, a guy who only posts one post every 2 weeks will have the same activity as another who spams a million posts a day after 3 months.
This is to prevent spammers from spamming just to increase activity and to get into signature campaigns or sell their accounts.
Why do you want to increase your activity/rank anyways?