Generally there are 3 reasons a house doesn't sell....
1. Is it priced well?
2. How is it marketed?
3. How does it show?
It's a good sign that you have at least received some activity with 2 offers. So you need to ask yourself why did they fall through? What can I do differently?
Time on market can hurt you. Get your property in front of buyers again by doing a price drop. What is your agent doing to drive traffic to your house?