>"if we don't slather things in yellow paint, how will players know what objects in the environment are interactable?"
this was solved over 20 years ago by Fatal Frame where the character turns their head to look at things you can interact with

>>713880685 (OP)
To be fair, the last game has a literal "ghost trail" for you to follow (pretty useful to go the wrong way on purpose for extra items and ghost points

silent hill did it first