Get closer to the endgame. With fewer pieces left in the position, the dominance of the two bishops can really be felt, as they can control both sides of the board at once. If the enemy knight doesn't have a secure outpost to use, it can find itself passive and restricted in its own territory.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown348"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[FEN "8/p6p/6p1/1p2k3/1P4PP/2P2K2/8/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... h5 2. gxh5 gxh5 3. Ke3 Kf5 ( { White can try: } 3... a6 4. Kd3 Kd5 5. c4+ bxc4+ 6. Kc3 Ke5 7. Kxc4 Kf4 8. Kc5 Kg4 9. Kb6 Kxh4 10. Kxa6 Kg4 11. b5 h4 12. b6 h3 13. b7 h2 14. b8=Q h1=Q { Draw. } ) 4. Kf3 a6 5. Kg3 Ke4 6. Kg2 Kf4 7. Kh3 Kf3 8. Kh2 Kg4 9. Kg2 Kxh4 10. Kh2 Kg4 11. Kg2 Kf4 12. Kh3 Ke3 13. Kh4 Kd3 14. Kxh5 Kxc3 15. Kg5 Kxb4 { Black wins with a large material
advantage. } 0-1