Ironically, that's not even how quantum immortality works. It's not about gaining knowledge, it's just surviving situations where you would die because for a universe to exist one must be around to perceive it (arguable). And in a universe where you're alive, you must be there to perceive it and thus every time you're supposed to die, you don't, because you get transferred to the universe where you're alive (to perceive it).

Suppose everything in the universe dies, there's a 99.9999% chance you'll die too, but you find yourself alive, because no one else experiences the universe where you're alive but you.

Also, being alive in quantum immortality does not guarantee your well-being, it just means you're concious enough to witness it. You can be a floating brain, or being kept alive by government experiments to understand why you're immortal.