It is estimated that it will take half a year to get below 1000 yuan. The simplest thing is to buy breakfast and snacks. Get up earlier than others and go to bed later than others. Do what others don't do.
If you have money, do a small business. Although it is difficult, it is not impossible. These days, picking up garbage can make a fortune.
If you have a gift, or a complete business plan or something, it will be much easier. Borrow it from the bank and pay it back bit by bit when you can change it.