How about moving your knight on b5 to d6 for a check,then move pawn to a3,for something different.If he takes your knight,your queen can take his,or,her's bishop.I guess the safer moves are,a3,or bishop to d2.

I think Bd2 is better.   a3 does not prevent ...Nxe4 as white's c knight is pinned and cannot play Nxe4.

 I also think I woulda played 3. d4 with an eye towards d5, but would like to hear what players stronger than I think.

pawn a3,