I have to say, coming up with books for this post was one of the easiest things I’ve ever done. Why? Simply put, I revisit these books every single year at some point in time to regain reference or spark new ideas/motivation.
First off, don't confuse this plateau you're in with being a bad player as I did early on. If you're doing something well and you're getting gigs, (paid or not as long as you're having fun) chances are you're doing something right and there is nothing wrong with that.