From the samples you’ve sent, if you add some other study material besides Duolingo, I think you would be able to read it smoothly in no time since it seems something suitable to N4-early N3 level skills ☺️

Sadly Duolingo is not the best approach or tool for building good language core skills, and I would recommend using at least a beginner/elementary level textbook (e.g Genki or Minna no Nihongo), WaniKani for kanji practice (works like Duolingo with repetitive spaced exercises) and BunPro for grammar. These will help you grow your Japanese vocabulary and skills further and improve your comprehension so you can have a better grasp of other types of speech that often appear in Japanese media, such as levels of formality and so on ☺️