Need Help getting back into Drawing

This is probably the 15,000th post here about getting some help in drawing, but I'm making one nonetheless.

Before all else, I am aware of basic anatomy. However, that is the fullest extent of my knowledge. I can't do backgrounds, dynamic poses, head positioning, etc. Lines of action confuse me and expressions fluster me. Anything beyond flat coloring is outside of what I know too. Basically, I'm quite a beginner... even though I've been into drawing for 4 years. At this point, I feel like I should have some knowledge on these topics.

Recently though, I've been having a difficult time doing any piece of art. I've been tracing and doing research, but when I spend an hour or two trying to apply these to my own style, nothing seems to come out right and I set the pen down for a different day. I feel like I have unnecessarily high standards for someone like myself, especially when I'm looking forward to pursuing a career in concept art.

As an artist, I think I need to find a fresh start to push myself forward. I want to relearn a lot, and perhaps learn something new, but I don't know where to start. Does anybody have any ideas to help renew my senses?