Salaries in IT

I’m 30 (M) and currently making a little more than 8 million a year with 4 years of experience in Japan as a software engineer. From next year, my goal is to earn at least 12 million per year. I’m not in AI and don’t have enough competitive programming skills, so the top companies (Google, Amazon, etc.) are not an option for me. So my question is: how realistic are my expectations? And if it’s pretty possible, how can I grow my skills (certification, etc.) to achieve the goal? 

by That_Track_6940