You get a masters degree in applied finance (investing) or something akin to that. Get a job managing investment portfolios or if you want to earn more money but get less experience at investing you can become a investment banker.
You will get a high income and both your job education and employment are focused on or are specifically investing.
You and the people that took this career path as a subsection of society are on average the best investors in the world.
Use your high income and investing skills to invest for yourself in your free time until you earn enough from your own investments that you should quit your work and only invest for yourself.
Do this from a young age and you have good odds of becoming rich due to compound (exponential) growth of wealth through investments.
from there its up to you.
Its not simple, probably most people cant do it. It's just a proven path to get rich similar to how being a brain surgeon is hard but has a known route you go down to get it.
There is no get rich in a way that is both easy and obvious