Can't fix bad shading

[Alessio]

Hello how can i fix this bad shading on my model?
The model i’m trying to do is based on an autocad dxf 2d file.

Her is the geometry of the model

I already enable auto-smooth and shade smooth. I also tried harden than normals on the bevel settings but it make things looks worst. Hope someone can help me.
Thanks

[Magnavis]

Have you tried recalculating your normals?

[antoniadamczyk]

Hello this because your mesh ist always triangulated
try selecting the face and split it with pressing the key Y or shade the selection flat

[Alessio]

I don’t get what pressing Y does but it worked. Normals was already good
Thanks

[antoniadamczyk]

Go to Edit then Mesh then Split then Selection(Y)