Go buy a 2-4 unit apartment building in reasonable condition, at a reasonable price, with reasonable debt.
Don’t sell it, even when the price goes up.
When you’ve saved enough, buy another one.
Do this four times, after which you won’t be able to get another 30 year fixed mortgage.
Then move on to larger buildings.
Don’t sell those, either.
If you carry out the advice above, you will 100% die rich. How long it takes for you to get rich will depend on how quickly you can save up down-payments. But the outcome is not in doubt, so long as you have the fortitude to stick to the plan.
The problem for most people is that they don’t have the fortitude. Do I? Not sure.