I have about a grand to my name and felt like if anyone knew how to use that money efficiently it would be biggerpockets!

What is the age of the property and it's infrastructure (roof, water heaters etc?)

My advice is not to waste your money on testing clean with bleach water and buy a mildew mold suppressant from hardware store it's a chemical you put in a pump up sprayer keeps mold from coming back if on a painted surface get a fungicide paint additive and repaint area.

The property itself pays off itself after mortgage, taxes, insurance, sewer, and water - and leaves some to reinvest.

It sustained water damage from a broken pipe in the kitchen last winter.

I think central heat/air could go out of style if ductless heat pumps become cheaper and easier to install or if window/portable heat pumps become cheaper, more compact/sleek, or more efficient.

I only consider fire and water flood an emergency(a snake once too), most items can wait until I call the owner and get an approval anytime there is a repair.

Upgrade to water saving fixtures? 

After owning a couple of rental properties all running efficiently and profitably!

Perhaps I could buy just a single property within the next year with a cash down payment first just to test the waters, and if the experience agrees with me, I could pursue more with the 1031.