Can I make performance friendly fake shadows with Post Processing Shader Mats? (And if so, how?)

Hey I’m working on a project, And In my project it’s gonna really be atmospheric. And for the atmosphere I’m going for I want shadows,
But here is the issue, the only way I can achieve shadows at this moment is to put the shadow quality to “3“. But here’s where my problem comes in, I kinda have a potato pc.
And for my game project I want as much performance as possible.

So, I was wondering if one could make fake shadows with post processing shaders, cause I’ve done many shaders, cel, ect (From tutorials), I even could make my own custom DOF. I’m not much of an expert on post process shaders, Still new to making shaders, So that’s why I’m asking

If anyone has any solutions or alternatives that could also work for performance friendly shadows without setting shadow quality to 3, please do tell me!

You’re probably better off trying to tweak the shadow settings instead of trying to fake shadows. You can switch between different types of shadows, CSM/cascade, capsule, distance field shadows, baked shadows, etc. You can also do things like limit the number of shadow cascades or shadow distance.