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 "Unknown61"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/7p/2K1k3/5p2/5P2/P5n1/1B6/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Ne2 { Controlling the bishop's ability to stop the h-pawn. } 2. a4 h5 3. a5 h4 4. a6 h3 5. a7 h2 6. a8=Q ( { White can try: } 6. Kc7 h1=Q 7. Kb8 Qb1 8. a8=Q Qxb2+ 9. Kc7 Qc3+ 10. Kb6 Qb4+ 11. Kc7 Qc5+ 12. Kb8 Qf8+ 13. Ka7 Qxa8+ 14. Kxa8 Nxf4 { Black wins with a large material advantage. } ) 6... h1=Q+ 7. Kc7 Qxa8 { Black wins with a large material advantage. } 0-1