A lot. If you want to get the light to work you have no way but to work on the light. You can’t just push it from the panel and hope it works.
The first setting you should balance on the light is bias.
contact shadows also kill you later on so max them at the start.
dynamic indirect might need to get checked.
Transmission is usually checked on final stuff.
can’t deep shadow is also usually ticked.
In lightmas you can mess with just about anything to get what you want, so you need to try stuff
AO is always good to have on. To use it you need a movable skylight.
on the skylight you need to balance brightness of shaded areas.
All individual meshes/actors dragged onto the level have their own render settings that should probably be tweaked.
this is necessary on skeletal meshes.
You also probably want to generate the distance fields for AO which might mean you need to toggle it in project settings.
There’s a lot to it. You just need to spend a couple days properly setting up your lights…