What would you want your universe to be? Be that and try to accomplish all that it is you’d like your dream universe to be. The journey to get there is immensely pleasurable.
But what if you don’t achieve it? What if you don’t eradicate world hunger? What if you don’t diminish world poverty?
Will the universe stop spinning? No. Someone else will take over from where you left-off and learn from your mistakes. Hence, any failures that you have will eventually advance the human race. And hence your overall objective to imagine a better universe will become complete. You say good-bye and hope the next generation takes over.
In any event, you don’t need to continue down any road to get to a better universe. Simply imagine what could be done and enjoy doing it.