About immortality. It is not fun. If you are a God, perhaps, Human Common sense gets lost. But let me break down the cons of immortality.
First, it is fun to meet people but you get to also see them die. If you are human, the first 200 years can already kill you inside, depending on how mentally stable your defenses are. However, if you do not feel anything at that point, you are dead. You won't have the trait called empathy. What happens if you lose that? You are nothing but a monster. People will start to get scared of you because you view the world like a killer would. If that is not enough, greed starts to takeover and they will hunt you down as an experimental subject for decades, centuries, eons, or endlessly. If that happens, your body may be alive but your mind is dead out of boredom and your nerves basically feel nothing.
Second, so you decide to live out of seclusion instead. Yes, that is the natural thing to do. However, that won't be true forever. The world changes and so is the geography. You either get buried alive, sink in deep waters, or people who speaks a new language and new civilization settles in your place. Your peace will never be forever, you will just be delaying the inevitable. If that is not bad enough, a chance of new lifeforms may come out of a world that will restart. Perhaps, something that can end your immortality and become unlimited food for them. Another plausible case is the planet exploding. You will be floating in outer space forever or even burn forever from the sun or something else.
Lastly, okay, so rather than the immortality you think of. Being a God is better instead? No. Not at all. The concept of God is even out of this world. We will never know if it's fun or boring. You create and destroy things or watchover a planet, galaxy, nebulae, etc. You are an intangible presence so you can neither feel love or lust. You cannot fap because what even is the point? You are a God. There's no need to reproduce. Long story short, where is the fun in being omnipotent? I would rather be an OP MC of a trash generic isekai rather than being a God anytime.
Thanks for reading.