I believe that consciousness and the experience of life are a combination of neural connections. After death, they are destroyed and you plunge into eternal nothingness. Eternal sleep, but without dreams. After death, the body will begin to decompose and disintegrate into individual atoms. In theory, if the atoms assemble into exactly the same neural connections as when you were born, and function and develop along the same path, then you will come back in life again, although this is unlikely. And it is not yet entirely clear when personality and consciousness are formed: at the moment of birth or when a certain development of neural connections is achieved.
In general, I am 90% sure that nothing will happen after death. Eternal nothingness.