If some army leaders attach great importance to you, I suggest you don't change your skills, so you won't have a chance to be a company commander, battalion commander or head of the regiment.
If the leader of the army doesn't remember you very well and you are poor, I suggest you change to a technical officer as soon as possible, with a promotion every three years, so as not to delay your future.
After changing to a technical officer, some majors can enter the office, such as economists and accountants, and some majors are more difficult. Some are semi-organs, such as doctors and nurses. Some are grassroots, such as engineers.
But the most important thing is to see if the leader can attach importance to you.