Loud thud from left front of 2014 subaru legacy on bumpy roads.

Hello, it could take some extra effort and time for a technician to be able to drill down to the root cause of the concern. I'm sorry you haven't had luck so far, but there's no saying that you should get rid of the car. You should work with the point of service to help towards the resolution as you've clearly given ample opportunity thus far. Alternatively, seek the guidance of a local shop near you who can give another opinion. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops