how to do that ?
Make less than 14 (but more than 1*) posts in a given activity period (14 days) resulting in less posts in total than activity.
E.g. for you
If you make only 1 post for each of the next 7 activity periods (98 days total) you would have
One more period and you should have:
Activity: 156
pot. activity: 168
Posts: 156
* see correction by tspacepilot below.