A pixel image which uses colour to convey appearance is not very useful to create a 3D project which wants light/dark to show height/depth.
You will need to re-draw each element and sculpt them individually if using the features in Carbide Create Pro:
https://carbide3d.com/hub/courses/create-pro/3d-tool-add-shape/
Or, model the 3D elements in a suitable 3D sculpting program such as Blender or Z-Sculpt or Sculptris…
Or, find a 3D model of this file/design…
Or, if you have access to the actual product, scan it using a 3D scanner:
All of this of course assumes that you have the permission of the original artist to make a replica.
The last time this sort of thing came up @KevBarn14 made a video, I think this one:
Getting rid of the square outline is simply a matter of not drawing it when re-drawing:
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and adusting/editing at need.