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Refrain from using First-Person Writing, please. This is a Fridge page, not a forum.

The only actual deaths in the film (aside from that of Mustache the cat) are all either suicides or an act of violent desperation. True to Real Life, victims of mental illness are much more likely to hurt themselves rather than other people and have a higher risk of suicide.
The Entity's true form resembles a rotting corpse with layers of malformed jaws within its mouth. In other words, its looks like a dead person with multiple other people within, not unlike a Matryoshka doll. Considering that it crawls inside of Rose's mouth to possess her, this is directly tied to how it controls its victims.
- Trauma is also generational and cyclical, which is why the Entity looks like many people stacked over each other.
The way the entity torments Rose (and presumably its other victims) heavily reflects how mental illnesses affect those in Real Life:
- Rose unknowingly packaged Mustache and gave it to her nephew. Harm or neglect to animals previously cared for is often a strong sign of a deteriorating mental state.
- When Rose has a vivid Imagine Spot about killing a patient in front of her boss, it heavily resembles an intrusive thought.
- Rose's problems often fall on deaf ears and she ends up severely isolating herself, much like how those with mental illnesses cry for help and are being spurned by family or friends.

The idea that the Entity can conjure up hallucinations to warp your perception of reality. Even if you try to find ways to get rid of the curse without having a witness or doing so ethically, the Entity would not allow it. It would misguide you with that hallucination, and when you feel comfortable, it would pull you out in an instant.
- When the phone disappears when the alarm was tripped, it serves as pretty brutal Foreshadowing that the Entity has the power to conjure up an Imagine Spot, and by extension, the Hope Spot in the end. One could say that Rose was doomed to die regardless of what she did.
Why does the film suddenly focus on Holly's son, Jackson after the infamous car jump scare? Well, he had a dead cat delivered to him on his birthday, an event likely to traumatize him. Given how the Entity feeds off of trauma, more specifically psychological trauma induced by death, it puts the birthday party scene in an even more harrowing light. The Entity didn't just do it to torment Rose, it did it to plant the seeds of trauma in not only Jackson, but most likely every other kid in the room by making them witnesses to Mustache's death too. The conditions are ripe for the Entity to come after him and who knows how many other families in the future.