How to buy rental property with no money

[Jayden Hamilton]

I own 3 properties, due to this I no longer have enough money to put down another down payment on any piece of property. I would like to buy a property with 4 units or more. How could I get a loan for something like this when I have no money to put down? Also, My debt to income ratio is high, how do the rich get richer and keep buying more and more properties whenever lenders look at your debt to income ratio.. They won't let me buy another property because my debt to income ratio is too high and also because I don't have a job because I'm in school full-time. How do I manage to get around this roadblock?