As you make improvements to your product, make sure you are measuring over time so you have a baseline to compare changes to past behavior. Know where marketing campaigns and promotions had the greatest effect, or none at all.
Measure user retention, churn, and stickiness based on a user cohort: first-time visit, signup date, first conversion. This provides you with a powerful metric to focus on early on. This can drive real action such as re-engagement campaigns, or user out-reach. Mastering this metric will drive success.
Group your user's average lifetime value by a cohort, or other significant datapoint. Find out who your most valuable users are, and where they came from. Increase your marketing spend on those valuable users, or increase re-engagement efforts on other segments to improve their lifetime value.
Do your product funnels differ by region or language? Do you have a problem with your copy? It could be as simple as running an A/B test. Test which wording or flow works better.
Bridging the Product-Data gap