Polish is my native language.
I'm fluent in English.
German on A2 or B1 level. Here's some of my methods and views.
I'm currently reading a book in this language called "Einer kam durch" or something like that (Using DeepL for translation sometimes.). There was a movie made about it, "The One That Got Away". To practise, I joined some German speaking discords and now try to talk to German people online when I can ( I'm not abusing anyone for free lessons. ) My grammar is terrible and I put together sentences mostly based on what feels right in the context. Knowing English helps a lot. Add to that the fact that Poland has many 'loan words', it's obvious that there's hardly any easier language I could learn, except maybe for Czech and stuff like that. Also, I've been to Germany like 5 times and have had it in school for years ( Though never paid much attention, since it always felt like it was starting from ABCD, numbers and before I knew it - deep diving into akkusativs, dativs, past perfekt prequemium perfektums wtf etc. Got so discouraged + they were boring as hell. My notebooks from the time are just doodles on top of drawings with random vocab I didn't know thrown into the mix. =D I'd love to join a German minecraft beta server, but that's very niche. ( By the way, from my time on some server I've found out that it is eastern Europeans that are mostly interested in the old versions, and hardly anyone else. ) In college I have German once a week, mostly reading comprehension and putting together sentences. I appreciate it and pay attention, even though it's at 8pm after a full day of classes.
Overall it's a nice language, often made boring by school, though. From my time in Germany, I quickly learned that only less than half of the people you meet speak English, sooo.... anyhow.
I'd like to learn Finnish. The country and the language itself is interesting to me. For now I know how to count, days of the week and basic words... I'd like to use something like Duolingo to learn it, but not Duolingo - it's boring, restraining, repetitive and overall sucky. Perhaps I should start from getting some used self-learning books? Maybe a tutor, but don't know if I want to throw money at this language just yet. Same goes for German.