Choose a topic you like and make posts for it. You can only get 14 activity points per 2 weeks. Technically you make 14 posts in one day wait 2 weeks come back and make 14 more posts again. This way you can get the maximum activity points in one day and not post everyday.
Yeah, it's not genuine participation this way but I can understand the frustration of writing fully sensible and informative posts and notice your activity is not calculated. I stopped writing altogether and didn't begin again until I stumbled upon this thread simply cause I thought it had all gone to waste.
Now tempted to schedule it as a bi-monthly activity...like going to the movies or something!