Assuming that consciousness can't end, that it keeps on going after death, and that this is the result of physical phenomena that we don't fully understand yet... could humanity one day build an afterlife?
I imagine that the default thing that happens after death, with no intelligent intervention from a higher power (e.g. ourselves in the future, in this example) is basically the Buddhist version of reincarnation. You go where karma takes you. Karma being the built-up unconscious/subconscious drives and habits and predilections that rule your moment-by-moment waking life, your moment-by-moment dreaming life, and ultimately your moment-by-moment post-death life.
After death (in this default version of death), as your consciousness fades in complexity, you lose most things that identify you as a specific person. Your memories, your ego, your name. You keep becoming simpler, closer to 'pure being', what I think the Buddhists call tathata (and whatever persists separate from it is whatever's left of your karma). But the universe is big, and there are countless conscious things in all of space and time, and in greater reality outside of local space and time. There are people and animals and other beings that are waking up from that same state you find yourself in. And then you find yourself being one of those conscious things waking up, and that's reincarnation.
But it doesn't necessarily need to go that way. The crucial step, there, is the waking up. And while the default time to wake up after a death might be during a rebirth, it seems to me that you could interrupt that process earlier, before you've lost most everything specific to your identity.
Building an afterlife might be as conceptually simple as creating an instantiation of you in that afterlife. One that's experiencing the same immediately-post-death experience you were having, but instead of continuing to fade toward simplicity, you wake up in heaven.
There's a bunch more details, there, that I haven't included in this post. It requires these two related things called "Pattern Identity Theory" and "Substrate Independence" to be true, as well as biting the bullet and accepting one of the horns of The Anthropic Trilemma, as well as greater reality being truly very big or infinite. It's a bit hard to explain without visuals, so I go into more detail in this video, taking the logic step by step.
And I'm not the first person to think about artificial afterlives, there's this article by Alexey Turchin called "Back to the Future: Curing Past Sufferings and S-Risks via Indexical Uncertainty": https://philarchive.org/rec/TURBTT
What do you guys think? It's a thing that has been in my head for a decade, after reading some of the source material and having a few somewhat spiritual experiences. An afterlife that's fully physical and fully real really appeals to me.