General DiscussionWhat role should I play?

Your current stats indicate that you're doing well as a carry/semi-carry. If your aim is to be more well-rounded, I suggest playing supports. Otherwise, stick to the aforementioned roles.

thank you~!!

And quitting DotA altogether because you're a "noob" is nonsense. Just play if you want to play :)

if you have a lot of free time on your hands play all-around if not -> jungling

You should play hard support because you never did it so it's a good way to improve yourself.

Just play every hero, if you reach to the point that you pick random and you have no problem what so ever about any hero you gonna get its already good.