Product design question

How would you improve Duolingo?

Practice this question out loud. An AI interviewer asks it, follows up like a real interviewer would, and scores your answer. Type or speak.

What this question tests

Tests product sense on a habit-driven consumer app where retention, not acquisition, is the core lever.

Identify Duolingo's core loop: daily lesson, streak, XP, and leaderboard, and ask which part of that loop is weakest today.
Segment users: casual dabblers who drop off in week one versus committed learners maintaining long streaks, since fixes differ.
Target early drop-off, since Duolingo's own public data shows most attrition happens in the first two weeks before habit forms.
Propose a fix: adaptive difficulty and a 'streak freeze' safety net expanded for new users, reducing the punishing all-or-nothing streak reset.
Define success: day-14 retention lift and streak-length distribution shifting right, not just total lesson completions.

Targets early retention specifically, since that's the stage with the most attrition and the highest leverage for a habit product.
Uses an illustrative number, e.g. assume day-1 to day-14 retention is 25%, and proposes a change aimed at moving that to 30%.
Proposes a concrete mechanic (expanded streak freezes for new users) rather than a vague 'make it more fun' suggestion.
Separates gamification levers (XP, leagues) from pure learning-quality levers (adaptive difficulty), showing awareness both matter.

Suggesting generic gamification additions without tying them to a specific retention stage or user segment.
Ignoring that over-gamifying (more badges, more leaderboards) can fatigue long-term users even as it helps new ones.

How would you A/B test the expanded streak freeze without hurting habit formation for existing users?
What's the risk of over-gamifying the app for serious language learners?