Scholarships are difficult.
Even if you are excellent, it is very, very difficult to get a full scholarship. Moreover, it must be directly linked to the grade of the school. The better the school, the harder it is to apply for a scholarship.
Family environment affects visa.
If your parents' income is low, it will be subsidized by your grandmother. Besides, your family has already immigrated. All these factors together can show that you have an immigration tendency, which is also a taboo in the visa process.
Subjective ability determines success or failure.
The above two points are just completely objective things. How much you can play subjectively depends on yourself. Including scholarships, including how to interview visa officers, especially the visa process, will be a more important process for you.
Subjective characteristics in the visa process
The subjective characteristics of American face-to-face visa will also help you. The form of student visa in the past two years is very good, so you still have hope.
Do your best.
Therefore, from now on, it is enough to do what you can. If there is anything I can do to help you further, you can call me.