Try and get out of Duolingo mode(law of diminishing returns!) and move to native audio(radio, podcasts, movies, songs) in your target language. Get used to being uncomfortable and not understanding anything at first. If you can make a game/habit out of this, you will make progress in due time(think a few years, not months/days). Search around for "immersion learning". I went into the rabbit hole a while back and learnt spanish but eventually being immersed in the language is the only way that seems to work.
Try and get out of Duolingo mode(law of diminishing returns!) and move to native audio(radio, podcasts, movies, songs) in your target language. Get used to being uncomfortable and not understanding anything at first. If you can make a game/habit out of this, you will make progress in due time(think a few years, not months/days). Search around for "immersion learning". I went into the rabbit hole a while back and learnt spanish but eventually being immersed in the language is the only way that seems to work.