How to get better?

I have been trying hard to improve my poker game for about a year now. I started as the tastiest fish imaginable and have read, discussed and played my way into being a fairly decent player. I went through a period where every time I played I learned something new. My learning curve was very steep and each new book or concept I eagerly adapted to my game. I feel like I have reached a bit of a plateau recently. I feel like I have the basics down (starting hands, pot odds, when to laydown, making reads etc) and I have had a fair amount of success, but not quite ready to quit my day job either. How do I go about improving my game from this point. Am I at a point where there is no teacher left but experience. Doyle Brunson says he is still learning the game. I know that I dont know everything there is to know (?). Has anyone been at this point and found the answer? Do I have to play against some tougher competition to "raise the level of my game"? Let me know.