I’m having constant issues with LOD and similar things, and I don’t know how to begin correcting them. It would not be such an issue if they didn’t change very suddenly. For example.: here are my shadows when a few meters away:
Experiment with the shadow override in your global post process volume.
Change cascades and rendering distance, see if that makes a difference. By default, shadows are set to render vast distances, most objects don’t need such high distance shadows (which reduces shadow quality overall).