If your opponent cannot do anything active, then don't rush the position; instead you should let him sit there, suffer, and beg you for a draw.
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[Event "rated untimed match"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "Unknown"]
[Black "Unknown273"]
[Result "0-1"]
[Annotator "David Hayes"]
[BlackElo "0"]
[ECO "A02"]
[FEN "6R1/8/1N1p1k2/P1pPnp2/2P1b3/4K3/1P4p1/8 b - - 0 1"]
[SetUp "1"]
[TimeControl "0"]
[WhiteElo "0"]
1... f4+ ( { Black can try: } 1... Ng6 2. Rxg6+ Kxg6 3. Kf2 Kf6 4. a6 { White
wins with a large material advantage. } ) 2. Kxe4 ( { White can try: } 2. Kf2 f3 3. a6 Nd3+ 4. Ke3 f2 5. Rf8+ Kg7 6. Rxf2 g1=Q { Black wins with a large
material advantage. } ) 2... Ng6 3. Nd7+ Kf7 4. Rxg6 Kxg6 5. Kxf4 g1=Q { Black wins
with a large material advantage. } 0-1