Evaluate the potential cash flow of other deals that come your way and compare it to the cash flow you're making now. 

Then find cities with some growth and where you can easily find houses that cash flow.   

Easily accessible by computer or phone with recordings. 

Water devastates properties and it could easily be days or weeks before someone notices. 

My first thought was to build, I could have fit a duplex on both lots easily.

And also learn how to evaluate locations and properties. 

Now if its a smokin deal and the 3 to 5% is easily absorbed then its worth it but you still need cash down  .. or you need a friends and family's to help you out.leveraging up 100%  to buy rentals you want to be careful there if you don't have a bunch of cash reserves since your tying up your heloc for the purchase  leverage to the eyeballs can be great if everything plays out perfect  if not it can be highly stressful.  

I listed a property for rent found a tenant with excellent credit and income, signed a lease and got 1st month rent with security deposit yesterday.They were due to move in August first, but just tonight called and they want out of the lease with some story about the father getting sick and needing to move there instead.My lease is specific about needing 60 days notice and losing security deposit if you don’t complete the lease term. (12 months)I should be able to rent the house easily, but probably not for Aug 1st so I’ll be losing a months rent.

A few of your tenants burn to death and you get sued for $50 million.The LLC for the property is supposed to make it so most money the Plaintiffs get from you is the assets in that one LLC, but since the court says your damages are $50 million then the attorneys can easily get your personal assets in your other LLC's and assets not in LLC's. 

As far as real estate, you could easily purchase additional units/properties leveraging your gains as down payment.