Objectively speaking, if there are no acquaintances and masters, it is difficult to calculate the quantity independently, and most companies will not give you a chance. First, if you can accept the basic salary now, go to the cost consulting unit to start from the basics, look at the picture, calculate the amount with software, and so on. But now many consulting units are unwilling to spend time training new people, which means that you may even have problems with your long-term living expenses.
Second, go to the training class. There are many training courses run by cost consulting companies themselves. Through systematic study, they have a place to stay inside and their salary will be higher than the former. After studying, you can also try to find a job in the construction unit.
Third, change the way of thinking, starting with librarians, learning by doing and then turning to cost. This will reduce the economic burden, after all, librarians can do it without knowledge.