This best practice is the most difficult to accomplish and the most powerful if you actually make it happen. If you can make one real change and attribute it to learning from the Butterfly survey results, engagement will instantly skyrocket. This doesn't have to be anything big, it could be something as simple changing the temperature, creating a quiet space, or even buying some plants for the office. What is most important is that you show your team that their feedback was received, processed, and turned into action.
You don't need to install an office slide; even the smallest changes will make a positive difference in employee life.