It'll take you a lot of time to learn a new language. There, I said it. Following the advice on this blog can expedite the process, but you'll still need to put in the hours.
When I was still in high school, I was forced to write in Italian/ German/ etc when I took exams. Most people would say "This is good practice."
How is this good practice?
How is making a bunch of mistakes in a foreign language beneficial?
Unless you have unlimited access to native speakers who can correct you, I strongly suggest you only practice in controlled settings. Doing exercises in high-quality language learning books is a great way to improve one's grammar without "learning" more mistakes.
