How to get out of the middle game

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Avatar of AzulShiva
I'm reading the middle game study books by Jeremy Silman and seem to be doing a good job in the middle game against other 1600's. In this game I paid particular attention to giving my knights outposts and achieving a superior minor piece.
 
I still have a long way to go in the book, but I constantly find myself in situations like these where the book doesn't help me anymore. I applied all the knowledge I achieved so far from the book, however when I achieved this position my brain went numb as completely clueless how to proceed and what my plan is. What is the idea now?
 
 
 

Here is the whole game: