Enthusiastic polyglot who loves challenges

I am a very passionate person who loves foreign languages. I am a sworn-in translator of English (into Slovak) and my level of German (I am a holder of C1 certificate), Spanish and French is C1. Moreover, I speak Italian, Hungarian, and Russian on approximately B1 level. I have been teaching English for 6 years and I really enjoy it.
I do not think that there is any general method, but listening to podcasts, reading, watching movies, and trying to communicate in a foreign language as much as possible is the key to success.