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 "Unknown45"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "4r3/pk6/2q5/1R6/P2Q4/2p4b/5P1P/R5K1 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... Qxb5 2. axb5 ( { White can try: } 2. Qg7+ Qd7 3. Qxd7+ Bxd7 { Black wins
with a large material advantage. } ) 2... Rg8+ 3. Kh1 Bg2+ 4. Kg1 Bc6+ { A difficult
move to find. } 5. Kf1 Bxb5+ 6. Ke1 Rg1# { The pawn on c3 is the winning
resource. } 0-1