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 "Unknown414"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r1k1/1b4p1/p3p1B1/1p1n3p/1P1B4/P5Pq/4QP1P/4RRK1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qg2+ ( { Black can try: } 1... Nf4 2. Be4 Nxe2+ 3. Rxe2 Bxe4 4. Rxe4 { With a likely draw. } ) ( { Black can also try: } 1... Nc3 2. Bh7+ Kxh7 3. Qc2+ Kh6 4. f3 Nd5 5. Re5 { White wins with a large material advantage. } ) 2. Kxg2 Nf4+ 3. Kg1 Nh3# 0-1