What do you do in this situation? Buying another property

[The Menace]

I have a house and I'm thinking of taking advantage of this great market opportunity to buy a newer house for myself, then rent out my existing house.

Now, I'm worried about the possibility that I won't be able to rent my current house in the future as my house is in a bad neighborhood.

How would you proceed and/or how would you prepare for months when you can't rent out a property? Thanks.