House for sales for long and has not been sold

[myfs_150916]

Hi Master,
My house advertised for sale since beginning of the year has not been sold successfully. Those similar qualities houses advertised in the same batch have already sold except mine.
Some said activate the NW with some red or yellow flowers could help. Some also say clear the clusters will able to sell house quickly. Unfortunately none of them work for me.
My house is facing NE at 63.3 degree. Selling price is based on market value and potential buyers came and view but gone without further negotiation.
Is there any way to attract serious buyer or sell house quickly?
Thank you.