I don't think your math is mathing. To end up with $5,000,000 after 12 years at, let's say, a constant 5% annual interest rate, you will need to invest over $25K per month over that time, or $300K per year of disposable income, after taxes, living expenses and so on. You would have to be very high level even in a FAANG to be able to do that.

I know, I know, everyone on HN says entry level FAANG makes $600K/year and drives a brand new Porsche, but it's not reality.