Hi! I am a 17 year old guy and here is what I think actually happens after death.
What we will become if time is truly infinite.
We are all electrons and quarks that will eventually turn into an entity or an object after the form they are in decays. After the decay the electrons travel to another atom and that atom catches another one over and over again, and if the timing is in the "great freeze" the electrons will turn into something after another big bang!
Because the great freeze in which the universe completely lacks changes is the perfect environment for a quantum fluctuation to happen which will create atoms that will get connected to the "immortal" electrons that have been in an completely other group of atoms creating a new being or an object. In conclusion we are the universe and we will experience being everything but just without the memory of the past creations we were in before and this cycle will continue forever .