@gaconvn I understand your situation, how you feel and why, because I have experienced it myself.
While I have not worked in Japan, I don't expect things to be fundamentally different from what I saw happening and what I learned while progressing my career in Europe, the US and Asia Pacific.
You are doing two things right already: 1) you are ambitious, 2) you ask for advice.
Ambition is essential, especially given the fast pace of technological development and organizational change. One may have to do a lot just to stand still nowadays.
Asking for advice is always a good way to figure out more quickly and more precisely what needs to be done.
I would say that it would be useful for you to understand what really drives you - i.e. what is(are) your ultimate objective(s). Is the goal just to earn as much money as possible? Or perhaps you are trying to determine which type of job would be most suitable and more enjoyable for you?
I get the impression that at this stage you just want more money
which is fine, of course, given that you are young and still at the beginning of your career.
Generally how much you are paid depends on how valuable you are perceived to be by your employer.
If you can do something another person cannot do, or you can do more then someone else or do it better than them, you will be more valuable than that person.
The good news is that you seem to have already answered your own question
Career advancement (which typically results in more money too) requires further developing your knowledge, gaining more experience and demonstrating your ability to deliver what your current employer or another prospective employer needs. So look for opportunities to do that (more knowledge, more experience). But don't push yourself too hard. It takes time and you have to accept that.
In practice, it means that it may not be next year but you can get to earning 12 millions, or even more!