Shader
For such a game graphics/toon style your shader looks promising.
I would replace the Principled BSDF with a simple Diffuse BSDF and the Fresnel with a Layer Weight node, plus a Color Ramp for more control. The Pointiness group just adds some color variation to the base color.
![shader](https://cdn.statically.io/img/i.sstatic.net/332JK.jpg)
Lights
For the lights try a so-called "tri-point lights" setup. Blender comes with the add-on "Lighting: Tri-lighting" that creates and places three lights for you. Activate the add-on in the preferences. Of course, you can add another light or two if you want.
![lights](https://cdn.statically.io/img/i.sstatic.net/a8Gdu.jpg)
Experiment with the position, the strength (3x 150W, 400W in the example), and the color of the lights.
"Sonic Suzanne" (Cycles)
![render result](https://cdn.statically.io/img/i.sstatic.net/8DSPM.jpg)