を売ろうと

try to sell

→ を
phrase Rare #36,792
try to sell Usually followed by する or した, as in を売ろうとする or を売ろうとした. It can also be followed by 思う to mean “think about selling” or “intend to sell.” を marks the thing being sold.
JA: 彼は車を売ろうとしている。
EN: He is trying to sell his car.

を売ろうとマジで思ってる

I'm seriously thinking about selling my house.

トム盗んだカメラを売ろうとした

Tom tried to sell the camera he had stolen.