So I need to increase my activity by two?
Yep, you'll need to wait the next 14 day period (but it is just 2 days later). Then if you make 1 post, your activity will reach 42 (since you have more than 42 posts now).
Edit: Forgot to post the link to the list of 14 day periods:
https://bitcointalk.org/index.php?topic=582736.0