After 1. e4 e5 2. Nf3 Nc6 3. Bc4 h6 4. d4:

[FEN "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"]
1. e4 e5 2. Nf3 Nc6 3. Bc4 h6 4. d4

What is the best answer to avoid pile up of opponent pieces in the centre as black? Especially after Nc3 and 0-0, this position sometimes gets awkward as it's difficult for the black queen to find a suitable square that both defends the king and attacks the opponent.

Thanks.