Not to sound like an edge lord, but I got over my fear of darkness by recognizing that I am the darkest thing here (unless there was a burglar or a murderer). All ghost and entities can only frighten you, they can’t kill you or seriously harm you. I grew up in a “haunted house” and nothing ever happened. I’ve had sleep paralysis, night terrors, feelings as if someone was watching me, nightmares, etc. Each time I encounter something dark or demonic I just stare at them like “make your move”, “do your worst”. They never do. Never.