@Mtaso Screen Space Ambient Occlussion SSAO is a bit janky within poiyomi, Its usually a technique you add to the world, not to the avatar. Please not that you will need the DepthGet prefab for it to work at all on your avatar.
As for contact shadows and LTCGI, they seem to be rather easy to enable, from there youll have to just mess with the intensities until it looks right.
Please note that for contact shadows to work youll need the DepthGet Prefab on your avatar, otherwise it whould not work in some worlds.
LTCGI will require the world to be specifically made to support it though, it seems.