I want be expertise in economics, this is the main goal of my master study.
....well what you have written has a grammar issue. You can say it;
I want be an expert in economics OR I want to develop my expertise in economics.
This is my suggestion;
My goal is to pursue a masters program in economics major, the discipline in which I wish to gain my expertise.Living in Indonesia became the pride of its own for me.
... this really does not fit in here. How living in Indonesia and being proud about it helps your masters? You need this sentence to set up a link with your previous and next lines.
But in many conditions, Indonesia was not able to get value-addedvalue-addition in exports.
I thinkthisThis really have impacted on the trade balance sheet of Indonesia.
... Present this as a general fact and not as one of your opinions.