to the end of living forever and becoming a posthuman “god”, of course! and then having a long time and far greater intelligence to figure out what my next steps will be :)
death, happiness, regrets — these are all complex engineering problems, waiting to be solved. and they will be solved, just a matter of time and processing power.
also happiness in particular is just a meaningless reward function in our genetic algorithms. do you really want to make your life about maximizing a particular set of hormones and neurotransmitters? i would rather transcend it.