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 "New York, New York"]
[Date "1967.05.15"]
[Round "?"]
[White "Bisguier, Arthur"]
[Black "Benko, Pal"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/8/8/3K4/5P2/2k5/8/4r3 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Rf1 { Rooks belong behind passed pawns. } 2. Ke5 Kc4 3. f5 Kc5 4. Ke6 ( { White's king must lead the pawn down the board. } 4. f6 Re1+ 5. Kf5 Kd6 6. Kg6 Ke6 7. f7 Rg1+ 8. Kh6 Kxf7 { Black wins with a large material advantage. } ) 4... Kc6 5. f6 Re1+ 6. Kf7 Kd7 7. Kg7 Ke6 8. f7 Rg1+ 9. Kf8 Rf1 10. Kg7 Rxf7+ { Black wins with a large material advantage. } 0-1