Many spiritual and philosophical traditions claim the immortality of the soul. Socrates argues forcefully for it in Phaedo.

Nearly all mystics (and many if not most neuroscientists) also come to the conclusion that our world of the senses is an illusion. This doesn't mean that the illusion doesn't have rigid laws, but it does challenge the materialistic assumption that the soul, or consciousness, becomes nothing at the time of physical/biological death.

If that is too fuzzy and mystical, I'd also suggest reflecting more deeply on the concept of technologically facilitated immortality of physical life on earth. For me, it is clearly a dead end. It can only lead to a complete annihilation of every human value.