Hard to say without knowing the specific product, but I'd focus on improving the UX pain points users encounter most often. Maybe do a quick survey to identify the top 3-5 areas users struggle with and prioritize those for the next release cycle. Small UX tweaks can go a long way in boosting engagement and retention.
Better performance monitoring and alerts when something's not right. Nothing worse than finding out about issues from users rather than your own monitoring.
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