Language-learning platform Duolingo is overhauling its business strategy to address slowing user growth and competition from AI tools. The company is increasing investments and rethinking its service tier structure to maintain relevance. These changes come as its stock price declines, reflecting investor concerns about its ability to adapt. The move highlights broader challenges in the edtech sector amid rapid AI advancements. The stock's performance could influence US tech equity markets, particularly for growth-oriented investors.