>>530823227
In theory, it's very easy. Just open your save file and change the playstyle from "AmbientHorror" to "Standard". You'll eventually get a quest which summons the monolith to you if you don't already have one on your map (Strange Signal). I have the note how saved, but I've never done it myself yet, so I can't promise that theory works exactly in reality. but it should be fine.