When you hit diminishing returns on a walled-garden language-learning app, it's time to create a continuous intake of real-world media at your level that you enjoy, plus a suite of inline understanding+memory tools to extract the maximum learning out of that media.

I have been following many of the recommendations on https://learnjapanese.moe/resources/. Most of them are language-specific, but perhaps you can still draw some inspiration from the methods and look for equivalent tools in your target language.

Read this and you'll realize why Duolingo has gone down the wayside

https://www.lennysnewsletter.com/p/how-duolingo-reignited-us...

Shows when incentives are aligned to shareholders vs users, that is the outcome you get