When you die it is decided by intergalactic space elves whether or not you should move onto a higher plane of existence we cannot see. You can think of it as a heaven, or an intergalactic internet where people from all over the universe can meet and celebrate life.
Consciousness does not originate in the brain. The brain is like a TV antennae that receives a message from very far away. When we "die" that connection is severed but your consciousness remains. Considering how little we know about consciousness it does not seem out of the realm of reality that perhaps the mechanisms behind it operate in a dimension we cannot perceive.
The purpose of our world is to generate/give birth to new "characters". The rules behind physics/biology are designed to create unique people to populate and grow the intergalactic consciousness.
However... these intergalactic aliens/space elves/machine gods do not accept just anyone onto their higher plane of existence. You are judged.
The problem of "bad people" exists because if they want to truly create unique entities and not robots to populate their world they must have a certain level of "randomness" within the system, resulting in variations that aren't so pretty.
When you die, depending on how "good" or "bad" you are, according to them, you may either move onto to this higher plane of existence, or be banished for eternity, aka "deleted" and forgotten.
What I think DMT does (I've never done it but I've listened to many people's accounts) is bounce back or severe your "signal" to the source so you can perceive temporarily, in a limited way, the "real" or "higher" dimension. They say these entities have nothing but love for us and wish the best for us in every way imaginable. They also pity us for having to endure with morality and mortality but they understand it is necessary to separate the wheat from the chaff.
The idea that our universe has no purpose is just as absurd as there being one. In fact I think it is much more likely there is a purpose given how specific the constants must be in order for the universe to have the conditions for life. Personally, I think it's insane to even consider this universe is "lmao random XDD" when you just factor in the amount of complexity that is going on right now.
This is why you should live your life like you have an audience. And why if you are choosing to be a bad person you should turn back because you're gonna miss out on how dope life can be when we become living gods and are allowed to create our own universes/simulations.