It depends on your age. If you are under 30 it's probably staying alive long enough until we reach longevity escape velocity.. If you are over 60 it's probably cryonics.
Edited in response to Vladimir_Nesov's comment.
If you are under 30 it's almost certainly staying alive long enough until we reach longevity escape velocity.
Downvoted for the insane "almost certainly".
What looks, at the moment, as the most feasible technology that can grant us immortality (e.g., mind uploading, cryonics)?
I posed this question to a fellow transhumanist and he argued that cryonics is the answer, but I failed to grasp his explanation. Besides, I am still struggling to learn the basics of science and transhumanism, so it would be great if you could shed some light on my question.