The best thing you can do is live there.  This may seem like a typical answer, but it isn't.  I learned Polish on my own and thought I knew it well until I went there.  I could not understand anyone.  I had to talk to people for many months to get to the point where I could communicate.  It was not like that when I learned other languages.  Polish is tough, and you need to respect that.  I would never have become as good as I am without actually living in the country and working there for a few years.  I am still nowhere near perfect, but being in the country really helped a lot.  That is my best advice for you.  By the way, I also study Russian, and I think I will have to either live there or make good friends with Russians to learn it well.  Good luck!

I am also a native Polish speaker. So another Polish person if you need help, just ask :D

Hi. I am a Polish native speaker and I am currently learning Russian. If you want feel free to ask me anything.

Thanks everyone for advice!! I really appreciate that!

Thanks Adam:) But how do I get to the Polish board?