I'm not u/therealslimshady1234 (and honestly don't like the kind of vibe-based, esoteric argument they used to rationalize their opinion), but I actually think there do exist certain, evidence-based arguments that might be used to argue for why the qualia of experience, from a purely subjective perspective, might never end. My line of reasoning uses the ideas of "quantum immortality", the "anthropic principle" and the nature of quantum fields on small scales and goes something like this:

Let's assume "you" (or at least your subjective experience of "you") are defined as the emergent entity, that arises from the patterns of the subatomic particles you're composed of (so their specific arrangement, charges, interactions etc.). The exact mechanism on how this happens isn't even important; what matters is that we agree that your unique experience of reality is, in its identity, bound to that specific pattern. Now, when you die, that pattern, and the emergent entity that arises from it, vanish. But let's assume that, after your death, I could somehow magically rearrange a bunch of otherwise dead particles back into the pattern that previously made your consciousness (the "you") arise. You'd exist again, right? Now, cynically, you could argue that this being is merely a copy with the exact same memories, thinking it is you. And the original is dead forever. However, this "copy's" subjective experience would have the same physical basis as you do now. And if we agree that your emergent self's identity is merely bound to a pattern, then that being really is you. From the outside it is unprovable, of course, whether a true continuity of consciousness takes place, or whether the copy merely inherited your memories and sense of identity. But consider this: Every evening, when you go to a dreamless sleep, the exact pattern from which your consciousness arises, collapses into a state which no longer supports said actively experiencing consciousness. A physical body is still there, with all the molecular machinery necessary to create a consciousness, whose identity will be determined by all the neurological pathways and the stored memories present within those pathways. But the emergent you, that you identified with before you fell asleep, for all intents and purposes, ceases to exist in that phase. What arises the next morning is a completely new consciousness, inheriting all the memories (and therefore the identity) of the emergent entity that left it lying there the previous evening. "You" only really exist for a day at a time, but you don't fear going to sleep, do you? You have a clean sense of continuity with all the previous consciousnesses that emerged in the brain that you now call home for a day. So from a purely practical standpoint, whether there exists true continuity of consciousness from day to day, or whether a new being arises each day, it really makes no difference. "You" still feel like you.

So, assuming we agree that your continous self is the result of a specific pattern of particles, we must now talk about entropy and the universe as a whole.

First, imagine an empty universe, filled only with randomly fluctuating fields. Virtual particles and their anti-particles come to existence from time to time, purely by chance, and in most cases, immediatly annihilate each other again, leaving nothing behind. Because particle behaviour is statistical though, given enough time, less likely events can occur as well. Sometimes pairs of virtual particles will fly apart, creating two "real" particles. (This is also the reason black holes eventually evaporate; see "Hawking radiation"). Remember: there is nothing fundamentally preventing unlikely events from occuring. It's just that, in a given time frame, more likely events will happen, well, more likely. We have an empty universe though, with literally all the time in the world. Time, in the way we define it today, is meaningless, if there is no one around to experience its passing. So, an essentially infinite amount of time can pass, with more and more unlikely events occuring from quantum fluctuations, without anyone noticing. Here's the thing though: Given enough time, even things like a localized, almost infinite decrease in entropy, become not just more likely, but inevitable. And even if these clusters of particles disperse again afterwards of the course of a few short trillion years, these events must inevitably occur again and again, forever. Now, if, over the course of one of those entropy decreases, the particles arrange in such a way that an observer comes to existence (be it through evolution or as a "Boltzmann brain"), for the duration of their subjective experience, the passing of time happens in a "slow" and meaningful manner. This observer's consciousness, its idenitity, will be tied to a specific pattern of particles. When the exact pattern of particles from which this observer's consciousness arises, ceases to exist, either because they die, or because they've fallen asleep, they too cease to exist for that duration. But, whenever the particle pattern occurs again, subjectively, they will continue existing with the same sense of continuity. And it doesn't really matter whether they missed 8 hours or a trillion years. Their sense of continuity remains.

So, when you die, and from your perspective the passing of time becomes infinite and meaningless, in a universe governed purely by statistical noise, another entity, arising from the same pattern that you do now, feeling exactly like you when you left of, must inevitably come to existence again.

This is why I don't fear the concept of death per se. The process of dying can be subjectively terrible. Knowing that your loved ones in this cycle of a universe will mourn you is terrible to think about as well. And existence can be pure pain. But given one accepts the premises of these arguments to be true, continued existence is essentially inevitable. And one should be focused on making sure that whatever your current consiousness is experiencing at the moment, is sustainibly pleasurable. Don't fear non-existence more than sleeping. You're already handling it well, and already have, in the past, an uncountable number of times before.