Ever feel like your game is going downhill?

Improving and learning are not necessarily linear. By that I mean (in this context) that often it takes time to integrate new concepts successfully. One possibility is that as you're learning new concepts you're struggling to apply them correctly. Consider whether you've been trying to incorporate anyhting new into your game and whether/when it's been working for you. That might help you isolate any problems, which you can then address.