Did you write that code? If not, from where does it come?
That code will not compile. You should mention that in the post and post the errors. Can we get it to compile, then add the features that you want?
It is unlikely that anyone will fix your code for you for free. If you want to pay someone to fix the code, try the About the Jobs and Paid Consultancy category.
I am not aware of any internal pull down resistors in the Micro processor.
And I find no mention of pull down resistors in the 32U4 data sheet or the Bounce library.
The breadboard photo may be useful, but a schematic would be much more valuable. Hand drawn, photographed and posted is fine. Include all pin names/numbers, components, their part numbers and/or values and power supplies.
EDIT: So my effort was wasted, replying to a cross post. That is irritating. I am done with this poster.