I want to give the floor reflection effect of isometric objects, but I don't know how to

Hello
I'm a beginner at illustrator

I was asked to make a floor reflection on the isometric png file that my friend gave me

So I'm telling you that the image that needs to be modified is not the Vector image

This is the object that I need to reflect on the floor. (Isometric wall)

So I tried it with a left and right reverse effect,

The result wasn't good ;[

I hope the image is made like the example above, is there any good way?