Photos 1 & 2: The house competes with the car because of the composition
Photos 2 & 4: The tonal ranges of the house and car are same. That makes it difficult to isolate the car
Photo 3 is lot closer to your objective. Agree with the others, different angles & CPL filter.
One more idea is to take multiple photos of the car with shallow depth of field and combine in post. If having the house in the background is needed, it would not compete with the car. You may try blurring out the house a bit in post if you are not willing for multiple photos and combining them.
Sreedhar.