Ready to purchase second multi, but all out of cash for the down payment? Options?

[Don G.]

Newbie here. I just purchased my first duplex…we closed two weeks ago. Positive cash is good. We’re set on cruise control. Good renters, property management is solid, I’m out of state. 
Now I want to do it again…the problem is I don’t have the required 25% down payment for another property. With patience, there are good deals out there. But what do I do when I’m cash strapped? 
I see so many investors say they buy countless properties with none of their own money. “Buy my rental property investment course today and you can too!” Im skeptical to say the least. 
I’ve got a solid 401k, a stock portfolio I can liquidate, $500k equity in my home, 

I don’t necessarily want to tap into that if there are other ways of securing a down payment. 
what would you do if you were in my shoes?