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 "Unknown91"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "2r3k1/1pr2pbp/p2pP1p1/4n3/4P2q/3BP1R1/PPP1N1QP/1K4R1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Nxd3 2. cxd3 Rc2 3. d4 Qh5 4. exf7+ Kf8 ( { Black can try: } 4... Kxf7 5. Qf1+ Kg8 6. Nc3 Qxh2 7. R3g2 Rxg2 8. Rxg2 Qh3 { A roughly equal game.
Draw. } ) 5. Nf4 ( { White dare not try: } 5. Rf3 Rxb2+ 6. Kxb2 Qb5+ 7. Ka1 Rc2 8. Rb1 Qa5 9. Rb2 Qe1+ 10. Nc1 Rxc1+ 11. Rb1 Rxb1# ) 5... Rxg2 6. Nxh5 Rxg1+ 7. Rxg1 gxh5 { Black wins with a large material advantage. } 0-1