If you achieve enlightenment, then what's next would be helping others to also attain it. There's a lot going on in this world and an enlightened being would be most beneficial right here where you are. Never accept any plane or state of consciousness as final. Don't seek to escape the world in some beautiful heaven, no matter how attractive. It will eventually become a trap. Liberation (as enlightenment implies freedom) cannot come from being attached to anything or anyone or any state of consciousness. I hope this helps.