Can I change the gate?

Don't change it to the north gate easily. In the traditional concept of Feng Shui in China, the orientation of the gate is very particular. Its orientation formula is: "Former Suzaku, Back Xuanwu, Left Qinglong, Right White Tiger." Generally, there are four main options for opening a house, namely, opening the south gate (Zhuquemen), opening the left gate (Qinglong Gate), opening the right gate (Baihumen) and opening the north gate (Xuanwu Gate). Xuanwu Gate is generally considered unlucky and also means "defeated", so the north gate is generally not opened at home. According to your introduction, the house faces south, and there are things in the back.