It may be that we simply don't "know" yet how to do that. A vast majority of our brains are unused. There's a lot of room for expansion there. It won't happen overnight, but I believe that the future of human evolution will not be physical so much as it will be mental and cognitive. Breaking into unused parts of the brain will yield some amazing results. If there is a God (and I personally believe there is), we will know that Supreme Being/ascend once we have achieved that full potential (one of the pillars of Gnosticism). Now we just have to figure out how to do that without using psychotropic drugs that could physically destroy the brain and the rest of the body in the process.
Gnosticism: ...To rise to God, the Gnostic must reach the "knowledge" which mixes philosophy, metaphysics, curiosity, culture, knowledge, and secrets of history and universe.