Im honestly stuck, and still somewhat new to blender ive exhausted all my options. I have a car body in blender that comes from slot car racings so its 3d printed but is going into a game now. Ive gotten most of the body panels pretty smooth from subdividing and lowering the poly count a little but it is still looking bad. The other problem I have is not being able to make the body panels thinner because of the vertices. All of the cars ive worked on were completely different and had about 1/100 as many faces and made it easy to just select certain parts. Any help is appreciated.
Here are some options
The first one is super simple if you don't want to put much work into it. Simply Right Click on your model, then at the top, just below Edit Sketch hit Shade Smooth, from there go into your object Data properties (the little green triangle), on the Properties Window, then look for the Normals tab. Open it and hit Auto Smooth. This will fix any shading errors that may occur.
For the second and longer option. at the top, hit Add and add in a Plane make sure it is centered on your car, then split it in half and delete the left side. from there, go to your Modifiers tab (the blue wrench) on the Properties Window. Hit Add Modifier and add a Mirror Modifier you'll also want to add in a Shrink-Wrap Modifier, these will allow you to only work on one side while it copy's to the other, as well as keep your new mesh right on the surface of your model
From there you can fully retopologize your model exactly the way you want using E to extrude more faces from the first one.