Creative Analysis - What are the possible approaches?
If you are looking to find effect of each feature on CTR then a correlation matrix can help you with it and you can do statistical test to prove it.
But if you want to find hidden causes then it a classical problem of prediction vs causation.
Suppose we find that giving discount help increase our campaign you may conclude that giving discount helps but it may actually happen that sales are usually higher that time of year and so giving more discounts necessarily doesn't help. Causal analysis can help us find hidden causes which will be hard to find.
For doing Causal Analysis you can refer Dowhy package.