Obsessed with death much?

I've been wondering lately
'what happens after you die?'
Not so much about what happens in the afterlife,
but what happens with the memory of a person after everyone they once knew dies.
Does your soul just slowly wither away like your body once did?
I mean, maybe no one currently knows, but there could've once been a Luba Mikpoli living in this world, but no one would know, because no one remembers him.
He could very well just be a figment of my imagination, but I do know for sure
that I don't wanna be like Mr.Mikopoli.
I want my soul to forever be a part of this world.