Step 1. Build the best possible churn model
It is time to create your own churn model. Start by creating a random forest on a subset of the data, and then (just like Nienke recommends) build a random forest on the whole dataset (be aware that this might be more time-consuming).
Do you get similar results when you use your whole dataset? And do the results seem logical to you?
Step 2. Elevator pitch
Set up a short presentation (an elevator pitch) to convince your boss to set up a retention campaign based on the churn model you just built. Mention the work you have done, what problem you are trying to solve and how you think you can solve it.
Need a little guidance on how to setup a good elevator pitch? Watch this movie and you are ready to go: https://www.youtube.com/watch?v=-t1ar_IpmUU