Hey, I decided to focus on fingerstyle. Right now I'm quite intermediate.
I tried to find some exercises, guides and tips but I just found very beginner things.

I'm also interested in being able to create music with this style. I'm mostly in Opeth-like mellow stuff, game and movies music. Creating probably don't fit in technique forum but it's better than two threads.

I guess learning music, learning theory ( I won't go in-depth in theory, just a little-bit )
and developing ear will improve me a lot. But do you have any other advices?
Find a first year classical guitar curriculum - the exercises should really help.