I need help changing the color for a logo design for a client

Hey guys, I am working on a logo design for a client, and they want it turned from color into a black and white.
There are many layers and different moving parts and pieces that make this a difficult challenge to just 'change' it from color to B&W. For example, to get a 3D effect with text, I had to stack multiple layers of that font. I don't want to go in and select every single one to change the color.
In my mind, the easiest solution would be to flatten the image in some manner so I could select anything based by color, and then change that color. How do I go about this?
I'm stumped as to the easiest solution, and this is due very soon. Anyone that would be willing to put in their thoughts would be greatly appreciated.https://scrabblewordfinder.vip/ https://www.applock.ooo/ https://www.7zip.vip/
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