After you've collected last years metrics, take a quick at them and write down what they're telling you.
Where there more orders than you expected?
How does the Average Order Value (AOV) of the entire year compare to what you've been using?
Where the most successful campaign results surprising?
Taking a quick look at the data is an easy and profitable task. You might have already felt something was going on, but having the data to back it up can confirm (or deny) that feeling.
If you've had trouble tracking and analyzing metrics for your Shopify store, Repeat Customer Insights tracks and analyzes dozens for you, including some less well understood ones like Customer Purchase Latency.
The app comes with a 14-day free trial so you can see how it works before paying.