To draw extra attention to your community campaign you have two options:
1) Put your campaign in the spotlight
Spotlighted items will draw more attention because they are highlighted with a visual label 'spotlight'.
How to do this? When you've made a campaign, click to open it in de admin panel. In the menu on the left, click on 'Community', which is the channel you've selected for this post.
Next, you just activate the checkbox "Put this item in the spotlight" and save your changes. Your campaign now has a spotlight label!
2) Make your campaign a featured item (pin your campaign)
Featured items are displayed at the top of the list of posts (or in a separate tab on the mobile app) inside your community.
You can find this by following the same steps as described for putting a campaign in the spotlight (cfr. supra). However, in this case you select the checkbox "Make this a featured item".