Learn how to handle some middle game positions. Replay some games below.
The following games in these online chess lessons show you how to handle middle game operations. Watch your opponents play at all times - move by move. After you have checked his potential and plans, you can think about your own problems.
In the last game everything will be explained clearly as I have played this game myself.
Discover your positional problems and try to solve them immediately like dissolving doubled pawns or organizing an attack on his king if the position tells you to do that. Listen to the needs of your position and don't start dreaming about nonsense moves and plans.
Ask your position what you should do. Ask every piece of yours where this piece would like to go to be actively placed.
Chess is not about what you want, but what the pieces want - never forget that.