Look for opportunities to make a favorable exchange. Somewhat paradoxically, one of the biggest advantages of holding the two bishops is that at any moment you can exchange one of them. The point is to simplify into an endgame where your remaining bishop is superior to your opponent's remaining knight or bishop.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown584"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "3r3r/1k3p2/p3pq2/1N6/QnpP4/6P1/1P3P1P/R4RK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qh6 2. h4 Qxh4 3. gxh4 ( { White can try: } 3. Nd6+ Ka7 4. Kg2 Qh2+ 5. Kf3 Qh5+ 6. Ke3 Nd5+ 7. Kd2 Rxd6 8. Qxc4 { Black wins with a large material
advantage. } ) 3... Rdg8+ 4. Kh2 Rxh4# 0-1