Pralaya the Cosmos : liberation from cosmic cycle of creation and destruction is impossible!

........that with Pralaya the Cosmos rolls back to the size of a half a thumb and unable to retain itself for long this cosmic source of energy (a cluster of all purified souls) again splits with a big bang spreading in all directions, thus creating a new cosmos and starting another cycle of birth and death for the purified souls who had become one with God.

Then how does one liberate himself from the cycle of birth and Death forever! Because if one somehow manages to liberate himself From the cycle of birth and death in this particular cosmic cycle 

Then he is destined to manifest in a body somewhere in the new Cosmos which is created subsequent to the destruction of the old cosmos.

So it is apparent that liberation from the cycle of birth and death in a particular cosmic cycle is possible, but liberation from cosmic cycle of creation and destruction is impossible! Then how does one liberate himself?