As the data scientist, interpreting a significant increase in revenue from a new feature in one of 20 countries, what would you recommend?

Focus on the practical implications and actionable insights. Since countries are independent, investigate the specific factors driving the revenue increase in that single country. Recommend a phased rollout of the feature to other countries, starting with those that share similar characteristics or market conditions with the successful one. Continuously monitor performance and adapt the strategy based on real-world results, rather than getting bogged down in theoretical statistical nuances.