Trace of the file is not required as it is already a grouping of vector objects. Trace is used for bitmaps.
Instead, what you will want to do is create a small ‘Offset’ of the outer most lines and put the resulting on it’s own layer set to cut as ‘Line’.
There are several issues with this file however that will cause problems with processing this job. You have open objects set to scan and that won’t work. To find them, go to ‘Edit’=>‘Select open shapes set to scan’. These will need to be resolved to product your desired scan.
Difficult to say as I do not know how you want the final output to look. The way this file was constructed, it’s using a bunch of elements to create the shapes but they are all independent from each other.
Do you have a sample of your desired outcome you can provide? This is what I see in ‘Preview’ after LightBurn removes the open shapes set to scan.
Here is the new lbrn file but it now says 12 shapes set to scan but weren’t closed. I followed your directions and apparently they wont close and form a single closed shape! Craziness