learn how to attack with your knights as a tandem and implement other pieces as the opportunities come, and conversely learn how to thwart anyone who knows how to use their knights. They can be very effective at sending a good defensive setup into disarray.
Find someone to play who doesn't mind time in-between moves, studying the board and the variations of all possible moves can take some serious time. The speed game is not good for learning, and generally is not played by better players, despite the games they portrayed in Searching For Bobby Fischer.