What he is saying is that the purpose of “Tracing” an image in LightBurn is to turn a raster graphic into vector lines. A DXF file is already vector lines, and does not need to be “Traced” as it is. Your best bed would be to probably go into Node Edit mode, and clean up the nodes to clean up your lines. I’ve also had some luck cleaning up stuff like that with Edit/Optimize Select Shapes. The combination of the two may help, just takes some time and experimentation.