I read plenty of books in German, bought DVDs, language books, puzzles. I went to the local museum and read the labels. I went to cinema to watch Star Wars 9. I didn’t understand much, but that was okay. If I had been afraid of failure or making mistakes, I would have never learnt German that quickly.
I read books and articles about learning methods especially about language learning. I even attended an online Polyglot gathering (people who speak several languages) to listen to talks about learning and various languages.
After 6 months and plenty of work, I managed to pass a successful B2 German exam in Salzburg. I was really happy and proud of myself.