Where would you stash this downpayment $30k so it hopefully gains a bit, but also wasn't too locked in or at risk?

We have been able to stash away about $25K since March from our W2 jobs.

Every month I stash a little more away to protect my self, the asset, and the tenants living there should something break.

Since closing we have found a few items stashed down there that makes us think the teenagers who live in one of the units are accessing it.

All of that cash being stashed away in case these things happen but is never used, then what?

My personality will not allow me to live poorly, while stashing away equity for a “future good life.”

As a newbie investor, I know I need to stash away money for repairs, capex and vacancies, but my question is where should that money be stashed? 

While inspecting the property, we went into the attic area to check insulation and found the largest stash of vintage pornography, toys, and BDSM objects and material I have ever seen...

Starting to think the only way to profit is finding gold bars stashed in the walls of this place.

The rest of the details were about the financial details of cash flow, interest rate, etc. so people can actually give informed advice as to whether I should or not.What a joker...