Trade pawns in the center to open up diagonals. The fewer pawns there are in the center, the more scope your bishops will have. Aiming both of your bishops at the opponent's king also increases the chance for tactical and mating combinations. Remember, without pawns in the center, enemy knights won't be able to use a centralized outpost.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown486"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/8/4k3/3npp1P/5P2/5K2/2B5 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nxf3 2. h5 Nh2 ( { Black can try: } 2... Ng5 3. h6 Nh3+ 4. Kf1 Ng5 5. Kf2 Nh3+ 6. Kf1 Kf6 7. Kg2 Kg6 8. Kxh3 Kxh6 9. Bxf4+ Kg6 { Draw. } ) 3. Kg2 Ng4 4. Kh3 Nh6 5. Kg2 Kf5 6. Kf2 Kg4 7. Bd2 Nf5 8. Bc1 e3+ 9. Ke2 f3+ 10. Ke1 f2+ 11. Ke2 Ng3+ 12. Kxe3 f1=Q { Black wins with a large material advantage. } 0-1