I have recently finished B1 online course from Goethe Institut. Now I can not continue B2 course at Goethe Institut for some reasons but I want to continue learning online. I would like to ask for resources to learn the German language online. I have tried Duolingo, Seedlang, Babbel, Memrise and other apps like these - I think they are just for fun and not a good fit for learning a language. How can I learn the German language online? Is there an online course?
Update: I have tried Duolingo. I think it is not effective because it is mostly grammar oriented. It does not provide a systematic approach - it is just random tests. I have a feeling that apps like that are built not for helping in learning a language but showing more ads. I think the interactive way of learning a language with speaking, listening, writing, reading tasks is more interesting and effective than solving tests in Duolingo.